The size of the hub is generally expressed as such, for example, to buy a hub, there will be such data: 18x8.5, 5x114.3, +42 18 (18 inches in diameter) x 8.5 (8.5 inches wide) 5 ( 5 fixing bolts) x114.3 (114.3 mm between bolt holes) +42 (Offset is +42 mm), so there is no "thickness" or "thin" in the definition of the steel ring. So let's take a look at the tires. The marking of the tire is as follows: 245/40-18. 245 when the width, 40 can be understood as the thickness, 18 refers to the 18-inch wheel. "Thick" or "thin", it is estimated that the landlord is asking for a tire.
The combination of the wheel and the tire is determined by the car. For example, the original 16x7 wheel with 225/55-16 tires, when you upgrade, the scientific choice is 18x8.5 with 245/40-18. The diameter of the hub is increased, the width is increased, and the thickness of the tire is thinner as the diameter and width are increased. In fact, the reason is very simple, if the thickness of the tire does not change, then the wheel will grind the body.
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