What Do the Numbers on Wheel Sizes Mean?

1 Answers
KatherineLee
07/30/25 12:30am
Automotive tire numbers and letters represent tire parameters. Taking 215/70R15 as an example, 215 indicates the tire section width is 215mm; 70 is the aspect ratio, meaning the tire sidewall height is 70% of the tire section width, R stands for radial tire, and 15 means the tire fits a 15-inch wheel hub. Below is relevant information about tires: 1. Tire lifespan: The wear life of tires is 30,000-50,000 kilometers. If the tire hasn't reached the wear limit or mileage but has been in use for 5 years or shows extensive sidewall cracks, it should be replaced. 2. Tire material: The main component of tires is rubber. The maximum storage and anti-aging duration for rubber, from natural latex to EPDM and nitrile, does not exceed 10 years, with the average service life of various rubber products in use being 3-5 years.
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