Excuse me, what does the index mean when the tire is marked as 8.25R 15?

8.25 means the tire width is 8.25 inches.

1 inch =25.4 mm

R stands for radial tire

15 means that the diameter of the opening in the tire is 15 inch.

That is to say, this tire is suitable for wheels with a diameter of 15 inch.

195/60R 14 85 hours

195 means that the tire width is195 mm.

60 indicates that the height from the opening in the tire to the tread is 60% of the tread width.

That is, the height from the inner opening of the tire to the tread is195x60% =117mm.

R stands for radial tire

14 is the inner diameter of the tire 14 inch.

85 is the load index, indicating that the corresponding maximum load is 520kg.

H is the speed code, indicating that the maximum safe speed is 2 10 km/h 0 km/h.

The last letters A to Z represent the certified speed class of tires, ranging from 4.8 km/h to 300 km/h..

Commonly used speed levels are:

Q160km/h

R170km/h

S180km/h

T190km/h

H2 10km/h

240 kilometers per hour

270 kilometers per hour

300 kilometers per hour

Z ZR speed is higher than 240 km/h.