What is the letter corresponding to the tire speed class

You are talking about the tire speed class, which refers to the maximum speed at which the specified load can be carried under specified conditions. Generally, on the sidewall of different tires, English letters will be used to indicate the speed grade of the tire.

Generally speaking, the speed of the vehicle is calculated by the rotational speed of the wheels. The same turn, the circumference changes, and the distance the wheel rolls changes.

If you want to change the tire, it is highly recommended to prefer the same specifications as the original factory. If you have to change, except for fine-tuning the tire width, it is best not to change the rest of the parameters.

Q – 160 kmh v 240 kmh.

r – 170 kmh w 270 kmh.

s – 180 kmh y 300 kmh.

t – 190 km/h Zr speed above 240 km/h.

H - 210 km/h zr If the tire specification in the instructions for use shows zr. For example, P275 40ZR17 93W, then the maximum speed class ("93w""w") for 270 kmh.

In the recent regulation for the standardization of tire markings, the speed symbol and load factor are included in the instructions for use of all classes except the continuously variable Z speed class.

For example: P225 60R15 95H is the instruction for use of the tire, indicating that the maximum load capacity of the tyre is 690 kg and the maximum speed rating is 210km h.

Officially, the speed rating indicates the maximum speed at which a tire can carry a specified load under specified conditions. The letters A to Z represent the certified speed class of the tires from km/h to 300kmh.

The English letters on the tires indicate the speed, which are represented by e, f, g, j, k, l, m, n, p, q, s, t, u, h, v, w, y, z; 2. These English letters indicate that the maximum driving speed of car tires is kilometers per hour.

The higher the speed level, the better the temperature resistance of the tire, because the air has to withstand the heat generated by the tire itself and the heat of the external environment at the highest speed level. From the perspective of tire design and material requirements, under normal circumstances, the larger the load index, the higher the speed level, the better the performance, and the more expensive the price of the same brand and size of the tire.

In order to better alleviate the deformation of tires and the generation of heat, high-speed tires will be strengthened vertically on the shoulder and tread, which will not only reduce the deformation of the tire during rolling, but also make the contact surface performance of the tire and the ground more stable. In general, tires with a higher speed rating have better grip and better handling when the vehicle is turning.

There are 30 tire speed levels from A1 to A8, B, C, D, E, F, G, H, J, K, L, M, N, P, Q, S, T, U, V, W, Y, ZR.

The specific tire speed levels are as follows:

1. The speed level is A1, and the speed certified by it is 5km h.

2. The speed level is K, and the speed certified by it is 110km h.

3. The speed level is A2, and the speed certified by it is 10km h.

4. The speed level is L, and the speed certified by it is 120km h.

5. The speed level is A3, and the speed certified by it is 15km h.

6. The speed level is m, and the speed certified by it is 130km h.

7. The speed level is A4, and the speed certified by it is 20km h.

8. The speed level is N, and the speed certified by it is 140km h.

9. The speed level is A5, and the speed certified by it is 25km h.

10. The speed level is P, and the speed certified by it is 150km h.

11. The speed level is A6, and the speed certified by it is 30km h.

12. The speed level is Q, and the speed certified by it is 160km h.

13. The speed level is R, and the speed certified by it is 170km h.

14. The speed level is A8, and the speed certified by it is 40km h.

15. The speed level is S, and the speed certified by it is 180km h.

16. The speed level is B, and the speed certified by it is 50km h.

17. The speed level is t, and the speed certified by it is 190km h.

18. The speed level is C, and the speed certified by it is 60km h.

19. The speed level is U, and the speed certified by it is 200km h.

20. The speed level is D, and the speed certified by it is 65km h.

21. The speed level is H, and the speed certified by it is 210km h.

22. The speed level is E, and the speed certified by it is 70km h.

23. The speed level is V, and the speed certified by it is 240km h.

24. The speed level is F, and the speed certified by it is 80km h.

25. The speed level is W, and the speed certified by it is 270km h.

26. The speed level is G, and the speed certified by it is 90km h.

27. The speed level is Y, and the speed certified by it is 300km h.

28. The speed level is J, and the speed certified by it is 100km h.

29. The speed level is zr, and the speed certified by it is more than 240km h.

30. The speed level is A7, and its specified certified speed is 35km h.

The speed class represented by the tire letters1. The letter J, the maximum speed per hour is 100 kilometers.

2. The letter K, the maximum speed per hour is 110 kilometers per hour.

3. The letter L, the maximum speed per hour is 120 kilometers per hour.

4. The letter M, the maximum speed per hour is 130 kilometers per hour.

5. The letter N, the maximum speed per hour is 140 kilometers per hour.

6. The letter P, the maximum speed per hour is 150 kilometers.

7. The letter Q, the maximum speed per hour is 160 kilometers.

8. The letter R, the maximum speed per hour is 170 kilometers.

9. The letter S, the maximum speed per hour is 180 kilometers per hour.

10. The letter T, the maximum speed per hour is 190 kilometers.

11. The letter U, the maximum speed per hour is 200 kilometers.

12. The letter H, the maximum speed per hour is 210 kilometers.

13. The letter V, the maximum speed per hour is 240 kilometers per hour.

14. The letter W, the maximum speed per hour is 270 kilometers.

15. The letter y, the maximum speed per hour is 300 kilometers.

16. The letter Z, more than 240 kilometers per hour.

Precautions for choosing tiresWhen buying tires, you should be equipped with tires of the same size, structure, manufacturer, and pattern, whether it is the load level index of the tire or the maximum speed under load, it needs to be consistent.

In particular, the tires with the macro front finger on the same axle are masked, otherwise (high-speed driving) is likely to affect the handling stability of the vehicle, and there are certain safety hazards. So you need to keep a snack when you buy, but don't mix them.

The meaning of the tire speed grade letter is the speed at which the tire carries the specified load under specified conditions: J, K, L, M, N, P, Q, R, S, T, U, H, V, W, Y represent kilometers per hour, and Z represents more than 240 kilometers per hour. Generally speaking, the lower the letter representing the speed class of the tire, the better the performance of the tire.

Tyres from P to T (150 to 190 km/h) are suitable for small and compact cars; U to V (speed 200 to 240 km/h) tires are suitable for mid-to-high-end cars; The high-performance W to Z tires are often used in large luxury cars and supercars because they can carry a maximum speed of between 240 and 300 km/h.