R14 indicates the tyre fits a 14-inch diameter rim. The "R" stands for radial construction. For example, 185/65R14 means a 185mm wide tyre with 65% aspect ratio, radial construction, designed for a 14-inch wheel.

Yes, they're identical. When the aspect ratio (profile) isn't specified, it defaults to 80%. So 185R14 = 185/80R14. Both are 185mm wide with a sidewall height of 80% of 185mm (148mm), fitting a 14-inch rim.

The "C" stands for Commercial, indicating a reinforced light truck tyre with higher load capacity. 185R14C tyres typically have 8-ply construction and carry 850kg per tyre — nearly double a passenger 185/65R14. They're designed for vans, trailers, and commercial vehicles.

Yes, but note the differences. 185/65R14 is 18mm shorter in diameter (590mm vs 608mm), which will make your speedometer read about 3% fast and lower your car by ~9mm. Both fit the same rim width (5.0-6.5"). Consult your mechanic if unsure about clearances.

No. 175/65R14 has a 65% profile (sidewall 114mm, diameter 584mm). 175/70R14 has a 70% profile (sidewall 122mm, diameter 600mm). The 70 profile is 16mm taller. Don't swap without checking your vehicle specs — speedometer and clearance will be affected.

Your tyres' combined load rating must exceed your trailer's gross vehicle mass (GVM). For a 2,500kg GVM trailer with 4 tyres, you need at least 625kg per tyre (load index 99+). Use 185R14 (102=850kg) or 195R14 (106=950kg) for safety margin. Always use LT/C rated tyres, not passenger tyres.

Passenger R14 tyres typically run 30-36 PSI depending on load and vehicle. Light truck R14 tyres run 45-65 PSI when loaded. Always check your vehicle's door placard for the manufacturer's recommended pressure — it varies by vehicle weight and tyre size.

R14 tyres fit rims from 4.5" to 7.0" wide depending on tyre width. 175/65R14 fits 5.0-6.0" rims. 185/65R14 fits 5.0-6.5" rims. 195R14 LT fits 5.5-6.0" rims. Check the tyre's sidewall or spec sheet for the recommended rim width range.