Understanding Tyre Speed Ratings
Every tyre sold in New Zealand has a speed rating — a letter code that indicates the maximum speed the tyre is designed to handle safely. You'll find it at the end of the tyre size (see our full guide on understanding tyre sizes) marking, e.g., 205/55R16 91V. But with NZ's speed limit at 100km/h (110km/h on some expressways), does it actually matter?
Common Speed Ratings
| Rating | Max Speed | Typical Use |
|---|---|---|
| T | 190 km/h | Family sedans, minivans |
| H | 210 km/h | Sport sedans, mid-range |
| V | 240 km/h | Performance vehicles |
| W | 270 km/h | High-performance sports cars |
| Y | 300 km/h | Supercars |
Why It Matters Even in NZ
Speed ratings don't just indicate maximum speed — they reflect the tyre's overall construction quality, heat resistance, and handling characteristics. A higher-rated tyre generally offers:
- Better heat dissipation during sustained motorway driving
- Improved handling and cornering stability
- More responsive steering feel
- Better emergency braking performance
Can You Go Lower Than Your Vehicle's Rating?
Technically you can fit a lower speed-rated tyre, but we strongly recommend matching or exceeding your vehicle manufacturer's specified rating. Going lower may affect your insurance claim in an accident and reduces the tyre's safety margin. The rating on your door sticker is the minimum — never go below it.
The Load Index Number
The number before the speed rating (e.g., 205/55R16 91V) is the load index — the maximum weight each tyre can safely carry. For most NZ passenger vehicles, a load index of 85-100 is standard. Utes, SUVs, and vehicles that tow should pay extra attention to load ratings.
Confused about which rating you need? Use our Tyre Size Finder or ask our team at Carter's Tyres Pukekohe — we'll match the right tyre to your vehicle's specifications.