Why Compare Tyres by Total Cost of Ownership?

Most Kiwi drivers compare tyres on price alone — and almost always end up paying more in the long run. A set of tyres at $400 that lasts 45,000 km costs $0.89 per 100 km, while a $700 set lasting 96,000 km costs just $0.73 per 100 km. The "cheap" tyres cost 22% more to run, plus you're buying and fitting them twice as often. This tyre cost calculator exists to reveal those hidden costs by using internationally standardised ratings that are already stamped on most tyres.

What Are UTQG Ratings?

The Uniform Tire Quality Grading (UTQG) system is mandated by the US Department of Transportation under 49 CFR 575.104. Every tyre sold in the US market must display three grades on its sidewall: Treadwear (a number typically between 100 and 800 that indicates relative lifespan), Traction (AA, A, B, or C indicating wet braking grip), and Temperature (A, B, or C indicating heat resistance at sustained highway speeds). We use these ratings to estimate how long a tyre will last and factor that into total cost.

Not all tyres carry UTQG ratings — particularly those manufactured for Asian or European markets. This doesn't mean the tyre is inferior; it simply means the manufacturer hasn't tested to the UTQG standard. See our methodology section for how we handle missing data fairly.

What Are EU Tyre Label Grades?

Under EU Regulation 2020/740, tyres sold in the European Union must display a standardised label showing Fuel Efficiency (A to E, measuring rolling resistance), Wet Grip (A to E, measuring wet braking performance), and External Noise (in decibels). Each fuel efficiency grade represents approximately 0.1 litres per 100 km difference — small per trip, but over 70,000 km at NZ fuel prices, upgrading from an E-rated to an A-rated tyre (4 grade steps) saves around $784 in fuel alone.

Many tyres sold in New Zealand don't carry EU labels because they aren't sold in EU markets. Brands manufactured exclusively for Australasia, the US, or Asia may not have these grades. Our calculator handles this by comparing only the data that's available across all tyres in your comparison.

How We Calculate Stopping Distance

The wet braking distance calculations are powered by the UBPS (Universal Braking Physics Simulator) — a 19-factor physics model validated against 345+ real-world test scenarios with an R² value of 0.9999 and just 0.71% average error. EU wet grip grades are converted to stopping distances using physics-based calculations: a Grade A tyre stops in approximately 35 metres from 80 km/h on a wet road, while a Grade E tyre needs 47 metres — that's 12 metres longer, or roughly 2.5 car lengths. You can explore the full physics model interactively in our Braking Simulator.

Star Ratings Explained

Each tyre receives a star rating across four categories: Safety (combining EU Wet Grip and UTQG Traction), Economy (combining EU Fuel Efficiency and treadwear for overall running cost), Longevity (based purely on treadwear rating), and Performance (grip-focused, where lower treadwear and higher wet grip ratings score better because softer compounds typically deliver more grip). These ratings help visualise trade-offs — a budget touring tyre might score 4.5★ for Longevity but 2.5★ for Performance, while a premium sport tyre might show the opposite.

Are Expensive Tyres Worth It in New Zealand?

It depends entirely on the numbers. Some premium tyres genuinely deliver better value because they last significantly longer (higher treadwear means greater tyre lifespan) and use less fuel (better rolling resistance). Others are priced for brand prestige rather than performance. Conversely, some budget tyres offer excellent value with high treadwear ratings, while others wear out so quickly that the cost per kilometre exceeds premium options. This tyre cost calculator takes the guesswork out of it by showing the actual cost per 100 km for each tyre based on standardised data, not marketing claims.

Frequently Asked Questions

Where do I find the UTQG rating on my tyre?
Look on the sidewall — it's printed as "TREADWEAR 400 TRACTION A TEMPERATURE A" (numbers and letters vary). On some tyres, it's moulded into the rubber near the size marking.

Why don't some tyres have EU grades?
EU labelling is only mandatory for tyres sold in the European market. Brands like Predator, many Anchee patterns, and numerous Bridgestone/Dunlop variants sold only in Asia-Pacific don't carry these labels. Mud terrain and specialist tyres are also commonly missing EU data.

Can I compare tyres with different amounts of data?
Yes — the calculator automatically adjusts. If one tyre has EU grades and another doesn't, those metrics are excluded from the star ratings for all tyres so the comparison remains fair. The cost per 100 km calculation works with just price and treadwear.

How accurate is the treadwear-to-km conversion?
We use a conservative multiplier of 160 km per UTQG point (so a 400-rated tyre ≈ 64,000 km). Real-world results vary 30–50% depending on driving style, road surfaces, alignment, and climate. The estimate works best for comparing tyres relative to each other rather than predicting exact lifespan.

Does this work for mud terrains and 4WD tyres?
If the tyre has UTQG ratings, yes — the cost calculations work for any tyre type. However, many mud terrains and all-terrain patterns lack UTQG data, in which case you'd need to estimate or source the treadwear rating manually.