How to Identify the Corresponding Tire Model for Steel Wheels
2 Answers
Steel wheels' corresponding tire models can be analyzed through numbers and letters. Here are the detailed explanations: 1. Number explanations: "255" refers to the tire's section width, which is the distance between the two sidewalls, measured in millimeters. "18" indicates the rim diameter. "109" represents the load index, where different load indices correspond to different maximum load capacities, usually measured in pounds or kilograms. 2. Letter explanations: "R" refers to the tire's construction, indicating that this tire has a radial structure. "Y" denotes the speed rating, where different English letters represent different speed ratings.
When I usually help neighbors check their cars, I've encountered similar issues. Checking the tire model corresponding to the wheel rim is quite simple. The wheel rim usually has engraved numbers, such as diameter 16 or 17, directly indicating what size tire it fits. The tire model is written on the sidewall, for example, 195/65 R15, where 15 is the rim diameter. If unsure, measuring the inner diameter of the rim with a tape measure is also accurate. For some older cars with severely worn rims where the numbers are blurred, a more professional approach is needed, using a vernier caliper to measure the width and offset. Ensuring a proper match when changing tires is crucial; otherwise, driving at high speeds can cause vibrations and even increase the risk of a blowout. It's best to refer to the vehicle manual or take a photo and send it to a car-savvy friend for confirmation, rather than relying solely on online data.
