Three tread pattern types, three different designs:

Most all-terrain and mud-terrain tyres use symmetric patterns. Most high-performance tyres use asymmetric patterns. Directional patterns are popular on passenger and touring tyres for wet weather performance.

📖 Complete Tread Pattern Guide with visual examples

Check the sidewall markings:

Directional tyres have:

• Arrow symbol pointing forward → or ⟳
• Text: "ROTATION", "DIRECTION", or "THIS SIDE FACING OUTWARDS"
• V-shaped tread pattern (like an arrow)

Asymmetric tyres have:

• Text: "OUTSIDE" or "THIS SIDE OUT" on one sidewall
• Sometimes "INSIDE" on the other sidewall
• Visibly different tread pattern on inner vs outer edges

Symmetric tyres have:

• No direction or side markings
• Same pattern across the entire tread width
• Can be mounted either way

It depends on your vehicle and driving — here's a quick NZ-specific breakdown:

For passenger cars and SUVs on sealed roads:

• Asymmetric — best all-round choice. Good wet/dry balance, excellent cornering, reasonable noise. Our Anchee AC818 UHP uses this design.
• Directional — best in heavy rain areas (West Coast, Waikato, Southland). V-pattern channels water efficiently.

For 4WD and off-road:

• Symmetric — industry standard for AT/MT tyres. Flexible rotation options, works well on all surfaces. Our Predator X-AT uses symmetric pattern design.

For highway touring:

• Symmetric 5-rib — quietest ride on NZ's chipseal highways. Our Anchee AC808 uses this design for long-life touring.

See our Terrain Types FAQ for more on choosing between HT, AT, RT, and MT patterns.

From quietest to loudest (general rule):

1. Asymmetric — typically quietest. Variable block sizes disrupt resonance patterns.
2. Symmetric (5-rib highway) — very quiet. Continuous ribs produce minimal pattern noise. Our AC808 and highway terrain options excel here.
3. Directional — moderate. V-pattern can create a characteristic hum at highway speed.
4. Symmetric (aggressive AT/MT) — loudest. Large blocks and wide voids generate significant road noise.

NZ factor: Chipseal road surfaces amplify tyre noise more than smooth asphalt found overseas, making pattern choice more noticeable for Kiwi drivers. See our Tyre Categories FAQ for more on the quietest tyre types.

Pattern type alone doesn't determine tread life — compound and construction matter more. That said, there are general tendencies:

• Symmetric (touring/HT): Often longest-wearing. Even contact patch, uniform wear distribution, and typically harder compounds. Our Anchee AC808 targets 60,000–80,000 km.
• Asymmetric (HP/UHP): Moderate life. Softer compounds prioritise grip over longevity, but even wear patterns help.
• Directional: Moderate life. Limited rotation options (same-side only) can lead to faster front-tyre wear on FWD vehicles.
• Symmetric (aggressive MT): Shortest on-road life. Large voids and soft compounds wear quickly on sealed surfaces, but excel off-road.

Key insight: Directional tyres can't be cross-rotated, which limits your ability to even out wear. This is a practical disadvantage for front-wheel-drive vehicles where fronts wear faster. Read more in our Tyre Care Guide.

Yes, but they're rare and expensive. Asymmetric-directional tyres have both a V-pattern direction AND different inner/outer zones. They require four unique tyres — left-front, right-front, left-rear, right-rear — because the direction AND side both matter.

Practical implications:

• Cannot be rotated at all (each tyre is position-specific)
• Replacement requires matching the exact position
• Significantly more expensive to maintain
• Found mainly on ultra-high-performance European sports cars

Directional tyres have a V-shaped or arrow-shaped tread pattern designed to channel water from the centre of the tyre outward to both edges. Think of it like a snowplough pushing material sideways.

How the design works:

• The "V" opens toward the front of the tyre's rotation direction
• As the tyre rolls forward, water is funnelled from the centre groove out through the lateral channels
• This creates a pumping action that clears the contact patch more efficiently than other patterns
• Result: better hydroplaning resistance, especially at highway speeds

Key limitation: The pattern only works in one direction. Mount it backwards and the "V" pushes water inward instead of outward — the opposite of what you want. Always check the rotation arrow on the sidewall.

📖 See our Tread Pattern Guide for visual examples of directional patterns.

Follow the arrow on the sidewall. Every directional tyre has a rotation arrow or the word "ROTATION" with a directional indicator. When mounted on the vehicle, this arrow must point in the direction of forward travel (toward the front of the car when viewed from the side).

Mounting rules:

• Left-side tyres and right-side tyres are not interchangeable (the arrow would point backwards)
• If remounting on rims, the tyre must be broken down and flipped if changing sides
• When buying new, your fitter should verify direction before balancing

Need directional tyres fitted correctly? Book fitting at our Te Puke workshop or get a quote with nationwide delivery.

Front-to-back on the same side only. Directional tyres cannot cross to the other side of the vehicle without being remounted on the rim (which is costly and usually not worth it).

Rotation pattern:

• Left front → Left rear
• Right front → Right rear
• Left rear → Left front
• Right rear → Right front

Why this matters for FWD vehicles: Front tyres wear faster on front-wheel-drive cars. With directional tyres, you can only swap front↔back on the same side, which limits your ability to even out wear compared to symmetric tyres that allow full cross-rotation.

Rotation interval: Every 8,000–10,000 km or at every second oil change. See our Safety & Maintenance FAQ for full rotation schedules.

The tyre won't explode, but wet performance drops significantly:

• Hydroplaning risk increases — the V-pattern pushes water inward instead of outward, trapping water under the contact patch
• Road noise increases — the pattern resonates differently in reverse
• Uneven wear develops — the tread blocks flex against their intended direction
• Dry grip is largely unaffected — you may not notice on dry roads

Primarily hydroplaning resistance. The V-pattern's main advantage is water evacuation — clearing the contact patch so the tyre can grip the road surface rather than riding on a film of water.

Impact on braking:

• Wet braking: Indirect improvement. By clearing water more efficiently, the tyre maintains better contact with the road, which improves wet braking as a consequence.
• Dry braking: Minimal advantage. On dry roads, the V-pattern offers no meaningful braking improvement over asymmetric or symmetric designs.
• ABS interaction: Directional patterns can work well with ABS because they maintain consistent water evacuation even during rapid deceleration.

For pure dry braking performance, asymmetric HP tyres typically outperform directional designs thanks to larger, stiffer tread blocks. Try our Braking Distance Calculator to see how tread depth affects stopping distances.

Asymmetric tyres have different tread zones across the width — each zone is optimised for a specific job:

Inner zone (inboard):

• Smaller, more numerous tread blocks with sipes
• More groove volume for water drainage
• Designed for: wet grip, hydroplaning resistance, water evacuation

Centre zone:

• Continuous or semi-continuous rib for stability
• Provides straight-line tracking and even wear
• Designed for: highway comfort, directional stability

Outer zone (outboard):

• Larger, stiffer tread blocks
• Less groove volume, more rubber contact
• Designed for: dry cornering grip, lateral stability, high-speed handling

This three-zone approach is why asymmetric tyres are the go-to choice for high-performance and UHP applications — they don't compromise one attribute for another.

The "OUTSIDE" marking must face outward. Every asymmetric tyre has "OUTSIDE" (or "THIS SIDE OUT") stamped on the sidewall that must face away from the vehicle when mounted.

Key mounting rules:

• The "OUTSIDE" sidewall faces you when you look at the tyre from outside the car
• Some tyres also have "INSIDE" on the opposite sidewall for confirmation
• Unlike directional tyres, asymmetric tyres CAN swap sides — left-to-right is fine as long as OUTSIDE stays out
• No rotation arrow needed — direction doesn't matter, only inside/outside

Need asymmetric tyres fitted? Book fitting or get a quote — we'll ensure correct mounting.

Cornering grip drops significantly:

• Reduced dry handling: The soft, siped inner zone is now on the outside — where cornering forces are greatest. This reduces lateral grip and makes steering feel vague.
• Reduced wet drainage: The outer zone's large blocks are now inboard, reducing the tyre's water evacuation where it matters most.
• Uneven wear: Tread blocks flex against their design intent, causing accelerated and irregular wear.
• Increased noise: The tread resonates differently from its engineered pitch sequence.

Unlike directional backwards: Inside-out asymmetric mounting affects dry AND wet performance. It's arguably more dangerous than a backwards directional tyre because it compromises cornering grip — which matters in emergency manoeuvres.

Check your mounting now: look at each tyre from outside the car. You should see "OUTSIDE" on the sidewall facing you. If you see "INSIDE," have them remounted. See our Compatibility FAQ for more on correct tyre mounting.

Yes — asymmetric tyres are often quieter. The variable block sizes across the three zones create different resonance frequencies that partially cancel each other out, reducing the overall perceived noise.

Why directional can be louder:

• The repeating V-pattern creates a consistent frequency — a characteristic "hum" at highway speed
• All blocks engage the road at similar angles, producing uniform (and more noticeable) noise
• The pumping action that makes them good in rain also pushes air, creating additional noise

NZ chipseal factor: On NZ's rough chipseal surfaces, the difference is more pronounced. The AC818 asymmetric pattern is noticeably quieter on State Highway 1 than most directional alternatives. Browse our AC818 range or compare passenger car options for quiet touring.

Symmetric tyres have the same tread pattern across the entire width — no inner/outer zones, no directional arrow. The left half mirrors the right half.

Design characteristics:

• Uniform tread blocks and grooves throughout
• Can be mounted in any direction, any position
• Often feature circumferential grooves for water drainage
• Tread block shapes are identical across the surface

Two major sub-types in NZ:

• 5-rib highway: Continuous ribs running around the tyre for quiet, even wear. Used on touring tyres like the Anchee AC808 and highway terrain tyres.
• Block-type off-road: Aggressive blocks with wide voids for mud/rock traction. Used on AT and MT tyres.

Three practical advantages:

1. Maximum rotation flexibility:

• Can rotate to any position — front/rear, left/right
• Full cross-rotation evens out wear much better than directional tyres
• Important for FWD vehicles where fronts wear faster

2. Simpler inventory and replacement:

• No left/right or direction concerns when buying replacements
• Any tyre in the set works in any position
• Spare tyre fits any corner

3. Dominant in off-road applications:

• Nearly all AT, RT, and MT tyres are symmetric
• Block-type symmetric patterns offer the best off-road versatility
• Our Predator range (X-AT, X-MT, RT Trail) all use symmetric designs for maximum flexibility

For daily driving on sealed roads, symmetric touring tyres offer excellent value and the longest tread life. Get a quote for your size.

No — it depends entirely on the specific tread design.

A well-designed symmetric touring tyre (like the AC808) with a 5-rib pattern can be just as quiet as an asymmetric HP tyre. The key noise factors are:

• Block size and spacing: Variable pitch sequencing (different-sized blocks) reduces noise regardless of pattern type
• Void ratio: More rubber contact = less noise. HT and touring tyres have low void ratios.
• Groove design: Narrow grooves produce less air turbulence than wide voids

What IS louder: Aggressive symmetric MT/AT patterns with large blocks and wide voids are significantly louder than any asymmetric tyre. But that's not because they're symmetric — it's because of the aggressive tread design required for off-road traction.

For the quietest ride, see our Tyre Categories FAQ for detailed comparisons.

Same axle — must match. Different axles — legal but not ideal.

NZ WOF rules (NZTA VIRM):

• Tyres on the same axle must be the same construction type (both radial or both bias-ply)
• Mixing tread pattern types (e.g., directional + symmetric) on the same axle is legal but not recommended
• Different brands on the same axle are fine as long as sizes, speed ratings, and load ratings match

Practical advice:

• Matching front pair + matching rear pair is acceptable
• Directional front + symmetric rear is OK but limits rotation options permanently
• Never mix radial and bias-ply on the same axle — this is a WOF fail

Full mixing rules covered in our Compatibility & WOF FAQ. Not sure what's safe to mix? Ask us.

Technically legal, but not recommended.

Why some people do it:

• Replacing two tyres at a time and matching what's available
• Using directional on the drive axle for better wet traction
• Budget constraints requiring mixed purchases

Why it's not ideal:

• No rotation options: You can't rotate directional tyres to the opposite side, and you can't swap front↔rear if they're different types. The tyres stay where they are until replacement.
• Inconsistent handling: Different grip characteristics front vs rear can cause unpredictable behaviour in emergency manoeuvres.
• AWD risk: Different pattern types can have different rolling circumferences, which matters for AWD drivetrains. See our Compatibility FAQ for AWD tyre matching rules.

When replacing pairs, we recommend matching all four with the same pattern type. Get a quote for a full set — it's often more cost-effective than you'd expect.

Asymmetric tyres can rotate to any position — as long as "OUTSIDE" stays facing outward. This gives you full cross-rotation capability:

Standard rotation pattern:

• Front-left → Rear-right
• Front-right → Rear-left
• Rear-left → Front-right
• Rear-right → Front-left

Or the modified X-pattern:

• Fronts cross to opposite rear
• Rears move straight forward

Advantage over directional: Full cross-rotation evens out wear significantly better than same-side-only rotation. This is a major practical advantage for FWD vehicles.

Rotation interval: Every 8,000–10,000 km. See our Safety FAQ for full rotation schedules and tips.

They mean the same thing — both indicate a directional tyre.

Common markings you'll see:

• "ROTATION →" with an arrow pointing forward — most common
• Arrow symbol only — curving arrow indicating forward direction
• "DIRECTION →" — less common but same meaning
• "THIS SIDE FACING OUT" — this indicates ASYMMETRIC, not directional (common confusion)

See our Tyre Sizes FAQ for more on reading sidewall markings and codes.

The centre rib is a continuous or semi-continuous strip of rubber running around the middle of the tyre's tread face. It's the backbone of the tread pattern.

What it does:

• Straight-line stability: Provides a constant contact surface for highway tracking
• Steering response: Creates an immediate connection between steering input and tyre reaction
• Even wear: Distributes load evenly across the tread face
• Noise reduction: Continuous ribs produce less noise than segmented blocks

Where you'll see it: Most highway terrain and passenger car tyres have a prominent centre rib. Most mud-terrain tyres deliberately omit it — the void space in the centre is needed for mud traction.

Our Anchee AC808 features a solid centre rib design for quiet highway touring. See how tread anatomy varies across terrain types in our Terrain FAQ.

Two types of grooves with different jobs:

Circumferential grooves (run around the tyre):

• Run in the direction of travel, forming continuous channels
• Primary function: move water from front to back of the contact patch
• Provide straight-line stability and tracking
• Most highway tyres have 3–5 circumferential grooves

Lateral grooves (run across the tyre):

• Run from the centre toward the shoulder (sideways)
• Primary function: push water from the centre outward to the edges
• Create the individual tread blocks by intersecting with circumferential grooves
• Angled lateral grooves improve water evacuation efficiency

The combination matters: Circumferential grooves move water lengthwise; lateral grooves move it sideways. Together, they create an evacuation network. More groove volume = more water cleared per second = better hydroplaning resistance. Our Braking Calculator shows how tread depth affects this.

Shoulder blocks are the tread elements at the outer edges of the tread face, where the tread meets the sidewall. They handle cornering loads and influence multiple performance traits:

Open shoulder:

• Blocks are separated with gaps extending to the tyre's edge
• Better for: off-road traction (blocks dig into soft surfaces), water evacuation, self-cleaning
• Common on: AT and MT tyres
• Louder on sealed roads

Closed shoulder:

• Blocks connect at the edge, forming a continuous band
• Better for: cornering grip on sealed roads, noise reduction, even wear
• Common on: passenger and HP tyres
• Quieter on NZ chipseal highways

When choosing between terrain types, shoulder design is one of the biggest factors affecting on-road noise. See our Terrain FAQ for detailed comparisons.

A 5-rib pattern has five continuous or semi-continuous strips of rubber running around the tyre's circumference, separated by four circumferential grooves. It's the gold standard for highway comfort.

Why 5 ribs?

• Quiet: Continuous ribs produce minimal pattern noise — significantly quieter than block patterns
• Even wear: Uniform contact pressure across the tread means consistent wear
• Long life: High contact ratio (more rubber touching road) and harder compounds can deliver 60,000–80,000 km
• Stable tracking: Excellent straight-line stability at highway speeds

Where it's used: Most highway terrain (HT) tyres and quality touring tyres use 5-rib designs. Our Anchee AC808 is a classic 5-rib touring tyre designed for NZ highway conditions.

Trade-off: 5-rib patterns sacrifice off-road traction for on-road comfort. The continuous ribs can't dig into mud or gravel the way individual blocks can. If you need any off-road capability, step up to an AT pattern.

Not necessarily. More grooves = more water evacuation capacity, but it comes at a cost:

More grooves provide:

• Greater water evacuation volume (litres per second)
• More biting edges for traction on wet surfaces
• Better hydroplaning resistance at speed

But more grooves also mean:

• Less rubber on the road: Less contact area means less dry grip and braking force
• Reduced block stiffness: More cuts weaken tread blocks, reducing handling precision
• More noise: Air pumping through grooves increases road noise
• Faster wear: Less rubber contact means higher pressure per unit area, accelerating wear

The engineering challenge: Tyre engineers optimise groove volume, angle, depth, and width to balance water evacuation against dry grip and noise. An asymmetric HP tyre achieves this by concentrating drainage grooves on the inner zone while keeping the outer zone solid for cornering. Get a quote and we'll match the right balance for your driving.

Sipes are thin slits cut into tread blocks — typically 0.3–1mm wide. They're too narrow to see clearly from a distance but play a huge role in wet and cold grip.

How sipes work:

• Each sipe creates two additional biting edges that grip the road surface
• When the block contacts wet road, the sipe opens slightly and acts like a tiny squeegee — wiping a thin film of water from the contact zone
• A typical passenger tyre has hundreds of sipes across all blocks
• In cold weather, sipes help the tread flex and conform to the road surface

Trade-off: More sipes = better wet grip but reduced block stiffness. This is why HP tyres use fewer, wider sipes (dry grip priority) while winter tyres use dense siping patterns (wet/cold grip priority).

Our Predator X-AT uses strategic siping across its blocks for improved wet sealed-road grip — a key feature for NZ's rain-heavy conditions.

3D sipes (also called interlocking sipes) are sipes with a zigzag or wavy profile through the depth of the tread block, rather than a simple straight cut.

How they differ from standard sipes:

• Standard sipe: Straight cut — block halves can flex independently, reducing stiffness
• 3D sipe: Zigzag or wavy cut — block halves interlock when compressed, maintaining stiffness under load

Benefits:

• Wet and cold grip of a heavily siped tyre
• Dry handling precision closer to a less-siped tyre
• Better resistance to heel-and-toe wear
• More consistent performance as the tyre wears

3D sipes are found on premium tyres and some mid-range AT/all-season designs. They're a key engineering advancement that helps resolve the sipe-vs-stiffness trade-off. Want to know if your tyres have 3D sipes? Send us a message with your tyre model.

Technically possible but not recommended for road tyres.

What aftermarket siping involves:

• Using a heated blade to cut additional sipes into existing tread blocks
• Sometimes offered by tyre shops in the USA and Australia
• Very rare in NZ

Why it's problematic:

• Void warranty: Any modification to the tread invalidates manufacturer warranty
• Structural risk: Cuts can go too deep, compromising the steel belt layer
• Reduced block stiffness: More cuts = softer blocks = reduced dry handling and braking
• Faster wear: Weakened blocks wear faster and unevenly
• WOF concern: While not specifically prohibited, an inspector could flag visible tyre modification as a safety concern

Variable pitch means the tread blocks around the tyre's circumference are deliberately made in different sizes — small, medium, and large blocks in a calculated sequence.

How it reduces noise:

• Each block size produces a different frequency when it contacts the road
• A single block size would create one dominant frequency — perceived as a loud hum or drone
• Multiple block sizes spread the noise across a wider frequency range
• This "white noise" effect is perceived as quieter, even though total energy may be similar

Computer-optimised sequences: Modern tyres use computer algorithms to calculate the ideal sequence of block sizes — called pitch sequencing. The goal is to create the most uniform noise distribution possible. Premium tyres invest more engineering in pitch optimisation, which is one reason they're quieter than budget alternatives.

This is why our AC818 UHP is noticeably quieter than many competing HP tyres — the pitch sequence is optimised for NZ driving speeds. See our Brands FAQ for more on Anchee engineering.

Tread wear indicators (TWI) are small raised bars moulded into the bottom of the main tread grooves. They sit at 1.6mm height — the NZ legal minimum is 1.5mm.

How to find them:

• Look for small triangle markers (▲) or "TWI" text on the sidewall — these point to the indicator locations
• Most tyres have 6–8 indicators spaced evenly around the circumference
• Look inside the main grooves for the raised rubber bars bridging the groove

How to read them:

• Tread well above bars: Good — plenty of tread remaining
• Tread approaching bars: Plan replacement soon — tread is getting low
• Tread level with bars: Replace immediately — at legal minimum
• Tread below bars: Illegal for road use — will fail WOF

Visit our Tread Depth Gallery for photos showing different wear stages. Check our WOF Tyre Guide for the full NZTA requirements.

Three methods — from quick to precise:

1. Tread wear indicators (visual):

• Free, instant — just look at the TWI bars in the grooves
• If tread is level with the bars, you're at ~1.6mm — replacement time

2. The $2 coin test:

• Insert a NZ $2 coin into the groove with the "2" facing into the tyre
• If you can see the full outer ring of the coin, tread is below ~3mm
• Good quick check — but not precise

3. Tread depth gauge:

• $5–15 from any auto parts store
• Press into the groove for an exact mm reading
• Check at least 3 points across the width and several spots around the circumference
• The lowest reading is your effective tread depth

Use our WOF Tyre Guide for detailed pass/fail criteria, or get a quote for replacements.

Three factors combine to accelerate wear:

1. Less rubber on the road:

• Aggressive patterns have high "void ratios" — 30–40% of the tread face is grooves/voids
• Highway patterns have void ratios of 15–25%
• Less rubber contact means higher pressure per square mm, which increases wear rate

2. Block squirm:

• Large, isolated tread blocks flex and deform under braking/cornering loads
• This flexing creates a scrubbing motion against the road surface
• The bigger and more isolated the block, the more it squirms

3. Softer compounds:

• Many AT/MT tyres use softer rubber for off-road grip
• Softer rubber wears faster on abrasive sealed surfaces
• NZ chipseal is particularly abrasive compared to smooth overseas asphalt

NZ practical tip: If you do 80%+ sealed-road driving, an AT tyre gives a much better wear-life balance than an MT. Our Predator X-AT is designed for this mixed-use balance.

Heel-and-toe wear is when the leading edge of each tread block wears faster than the trailing edge, creating a sawtooth profile you can feel by running your hand across the tread.

What causes it:

• As the tyre rolls, each block contacts the road at its leading edge first
• The block deforms under load — the leading edge digs in and scrubs
• The trailing edge lifts slightly as the block passes through the contact patch
• Over thousands of kilometres, this creates measurable height difference across each block

Factors that make it worse:

• Aggressive block patterns (MT, AT) — larger blocks squirm more
• Under-inflation — increases block deformation
• Infrequent rotation — concentrates wear on one position
• Non-drive axle — blocks slide rather than being driven

Prevention: Regular rotation (8,000–10,000 km), correct pressure (check yours here), and alignment checks. Once established, heel-and-toe wear causes a humming noise that increases with speed.

Yes — uneven tread wear is one of the most common causes of tyre-related vibration.

Types of vibration from uneven wear:

• Cupping/scalloping: Creates rhythmic thumping — sounds like a washing machine at speed. Usually caused by worn shocks/struts or imbalance.
• Heel-and-toe wear: Creates a humming that increases with speed. Common on aggressively-patterned tyres.
• Flat spots: Creates vibration at specific speeds. Can be caused by hard braking (ABS issue) or from sitting stationary for extended periods.
• Feathering: Creates a high-frequency buzz, especially on cornering. Usually caused by misalignment.

What to do:

• Get an alignment check — most common underlying cause
• Rebalance the affected wheel(s)
• Check suspension components (shocks, struts, bushings)
• If wear is severe, the tyre may need replacing — once cupping is established, it tends to get worse

See our Safety FAQ for detailed wear pattern diagnosis, or contact us for advice on your specific situation.

Tread pattern is your primary defence against hydroplaning. When a tyre can't evacuate water fast enough, a wedge of water builds up in front of the contact patch and lifts the tyre off the road surface.

Pattern type impact:

• Directional (V-pattern): Best hydroplaning resistance — channels water outward from centre with pump-like efficiency
• Asymmetric: Good — inner zone typically has more drainage channels designed for water evacuation
• Symmetric (5-rib): Moderate — circumferential grooves handle water but with less lateral evacuation than directional
• Symmetric (aggressive MT): Variable — large voids move water but wide blocks can trap it

Key factors beyond pattern type:

• Tread depth: Most critical factor. At 80 km/h, a new tyre (8mm) disperses roughly 15 litres/second. At 3mm, capacity drops dramatically.
• Speed: Higher speed = less time to evacuate water. Risk increases exponentially.
• Tyre pressure: Under-inflation flattens the contact patch, reducing evacuation efficiency

Try our Braking Distance Calculator to see how tread depth affects stopping distances in wet conditions. For more detail, see our Safety FAQ.

3mm minimum recommended — 4mm for rural highways.

NZ-specific factors:

• NZ gets rain year-round in most regions — not just a seasonal issue
• Chipseal roads pool water more than smooth asphalt
• Many rural highways are 100 km/h with no central barriers — hydroplaning risk is high
• 4mm is a safer threshold for highway driving, especially in Waikato, West Coast, and Southland

Check our WOF Tyre Guide for the full legal requirements. Ready for new tyres? Get a quote.

Yes — wider tyres are more susceptible to hydroplaning. A wider contact patch must displace more water across its width to maintain road contact.

The physics:

• A 245mm tyre needs to move significantly more water per second than a 195mm tyre at the same speed
• Wider tyres have a shorter, wider contact patch — more width for water to cross
• Water pressure builds up more easily across a wider front edge

However — it's not that simple:

• Wider tyres often have more groove volume to compensate
• Tread depth matters more than width — a narrow worn tyre hydroplanes before a wide new tyre
• Weight matters — heavier vehicles push through water films more easily
• Speed is the biggest factor — reducing speed from 100 to 80 km/h in rain makes more difference than tyre width

Considering a wider tyre upgrade? See our Tyre Sizes FAQ for the NZ 5% diameter rule and Size Calculator to check compatibility.

Yes — on sealed roads, MT tyres generally have longer wet braking distances than AT, HT, or passenger tyres of the same size.

Why:

• Less rubber on road: MT void ratios of 30–40% mean 30–40% less rubber contacting the road surface
• Reduced contact area: Less rubber = less total friction force available for braking
• Block squirm under braking: Large isolated blocks flex and deform, reducing effective braking force
• Softer compounds: Many MTs use compounds optimised for rock/mud grip, which behave differently on wet asphalt

Paradox: MTs have massive groove volume for water evacuation, but this doesn't fully compensate for the reduced contact area. The tyre may resist hydroplaning well, but once the limited contact patch reaches its grip limit, it breaks away more abruptly.

No — slick tyres (no tread pattern) are not road legal in NZ.

NZ requirements (NZTA VIRM):

• All road-legal tyres must have at least 1.5mm tread depth across 75% of the tread width
• Tyres must have visible tread pattern across the primary contact area
• Slick (no tread) tyres fail WOF immediately

Why slicks exist:

• On dry race tracks, slick tyres provide maximum grip — 100% rubber contact with the road
• But they're useless in rain — zero water evacuation means instant hydroplaning
• That's why F1 cars switch to grooved "wet" tyres in rain — exactly the same principle as road tyre tread patterns

Semi-slicks: Tyres with minimal tread pattern (sometimes called "track day" or "R-compound" tyres) are technically legal if they meet the 1.5mm minimum, but they wear extremely fast and perform poorly in rain. Not recommended for NZ conditions.

Check our WOF Tyre Guide for all tyre-related WOF requirements.

Stone retention is when small rocks get trapped in tread grooves and can't be ejected during normal driving. Over thousands of kilometres, trapped stones can drill into the tyre casing, causing slow punctures or structural damage.

Patterns that minimise stone retention:

• Wider grooves: Allow stones to fall free during tyre flexion
• Tapered/angled channels: Stones slide out rather than wedging
• Stone ejector ridges: Small raised bars in the groove base that push stones out as the tyre deforms
• Open shoulder designs: Stones can exit from the tyre's edge

NZ relevance: Chipseal roads produce more stone retention than smooth asphalt found overseas. If you regularly drive NZ rural roads, stone ejector features are worth looking for. Our Predator X-AT incorporates stone ejector technology in its groove design. See our Terrain FAQ for more on choosing between patterns for NZ conditions.

Chipping is when small pieces of rubber break away from tread block edges — often visible as rough, torn-looking block edges. It's common on tyres driven extensively on gravel, loose metal roads, or freshly chip-sealed surfaces.

Tread design factors:

• Block size: Smaller blocks are more susceptible to chipping — edges flex more relative to block mass
• Compound hardness: Harder compounds resist chipping better but sacrifice wet grip
• Block edge profile: Rounded or chamfered edges chip less than sharp 90° edges
• Void ratio: More exposed edges = more chipping opportunity

For NZ gravel roads:

• AT tyres — best balance. Block edges are designed to resist chipping while providing off-road grip.
• MT tyres — large blocks resist chipping well, but may chunk on very rocky surfaces.
• Highway tyres — most susceptible to chipping on sustained gravel driving. Small blocks and harder compounds crack rather than flex.

If you regularly drive NZ's 10,000+ km of unsealed roads, an AT pattern is the pragmatic choice. Get a quote for your vehicle.

Self-cleaning means the tyre's tread ejects mud and debris as it rotates, maintaining grip. A tyre that packs with mud becomes a smooth slick — useless for traction.

Key self-cleaning features:

• Wide voids (high void ratio): More space between blocks = easier for mud to fall away. MT tyres target 30–40% void ratio.
• Tapered block edges: Mud slides off angled surfaces as blocks flex
• Open shoulder: Mud can exit from the tyre edge, not just the front/rear
• Stepped groove bottoms: Prevent mud from packing tightly in the groove base
• Block spacing: Wider, more consistent spacing prevents mud from bridging between blocks

Directional MT patterns can be excellent in mud — the paddle-like pattern scoops and throws mud like a tractor tyre. However, these same patterns perform worse on wet sealed roads than symmetric MT designs. See the comparison in our Terrain FAQ.

Browse our MT collection or get a quote for your 4WD.

Yes — significantly. On loose surfaces like gravel, tread pattern matters more than on sealed roads because grip mechanics are completely different.

On sealed roads: Tyres grip through rubber-to-road friction. More contact area = more grip.

On gravel: Tyres grip by digging into the surface. Individual blocks need to penetrate and push against loose material.

Pattern type impact on gravel braking:

• MT/aggressive block: Shortest braking distance — large blocks dig in and anchor
• AT: Good — moderate blocks provide reasonable penetration
• HT (5-rib): Longest braking distance — continuous ribs slide over the surface rather than digging in
• Directional (road pattern): Variable — V-pattern can channel loose material but blocks may be too small to grip effectively