When it comes to road grip, braking distance, and driving safety, tires are one of the most critical components of a vehicle. One important detail many drivers overlook when choosing tires is the tire speed rating. So, what is a tire speed rating, what do the letters on tires mean, and how do you choose the right one? Here is a complete guide.
The tire speed rating is an international standard that indicates the maximum speed a tire can safely handle. It is represented by a letter printed on the tire sidewall.
For example:
If your tire says 91H, the letter H means the tire can safely reach up to 210 km/h.
Affects vehicle performance
Determines heat resistance at high speeds
Impacts braking distance and road grip
Ensures compatibility with manufacturer standards
Using a lower speed rating than recommended may increase the risk of tire failure at high speeds.
| Letter | Max Speed |
|---|---|
| N | 140 km/h |
| P | 150 km/h |
| Q | 160 km/h |
| R | 170 km/h |
| S | 180 km/h |
| T | 190 km/h |
| H | 210 km/h |
| V | 240 km/h |
| W | 270 km/h |
| Y | 300 km/h |
| (Y) | Above 300 km/h |
👉 Sports cars usually use V, W, or Y, while city cars and SUVs commonly use T or H.
Manufacturers specify the minimum speed rating. Never choose a lower rating.
Winter tires may have a slightly lower speed rating because of softer rubber compounds.
Frequent highway driving → H or V
Mostly city driving → T or H
Performance driving → W, Y
Speed rating should always be evaluated together with load index (e.g., 91, 94).
Excessive heat buildup
Loss of traction
Longer braking distance
Tire deformation
Blowout risk
Choosing cheaper tires with lower ratings can create serious safety risks.
Tire speed rating is one of the most important factors affecting safety and performance. Always choose tires that match your manufacturer’s recommendation.
👉 At WindyCar, all vehicles are equipped with regularly inspected tires to ensure safe driving across our 23+ locations in Türkiye.
