Cadillac xt5 tire model specifications: Cadillac xt5 tire parameters are 18 inch low and 20 inch high. The tyre size of the test vehicle is 235/65R 18, and the brand model is Michelin PrimacySUV series. Although the rim size is much smaller than the high-end model, the latter's tire size is 235/55R20, which is exactly the same as the brand model. Therefore, the measured results are similar to the previous tests, and 37.52m is absolutely excellent. Tire is one of the important parts of automobile. It is in direct contact with the road surface, and together with the automobile suspension, it reduces the impact of the automobile when driving, and ensures that the automobile has good ride comfort. Ensure good adhesion between the wheel and the road surface; Improve the traction, braking and passability of the car; Bearing the weight of cars, people pay more and more attention to the important role of tires in cars. With the development of automobile industry, tire technology is also improving. For example, from the early 1920s to the mid-1930s, automobile tires changed from low-pressure tires to ultra-low-pressure tires. Since the 1940s, tires have gradually changed to wide rims. The appearance of tubeless tires in the late 1940s; In the late 1950s, low-profile tires came out and so on.