1. Rim width: usually represented by 5.5J, 6J, and 7J, and the unit is inch. Usually, tires with a tire width of 185 require a rim width of 5 inches, 195 requires 6 inches, 205 requires 6.5 inches, and tire widths of 215 require It needs to correspond to the 7 inch wide rim. 2. Rim diameter: There are 12, 13, 14, 15 and other specifications, and the unit is inch. At present, the vehicles on the market have models equipped with 20-inch rims, such as InfinitiFX35, BMWX5, etc. 3. PCD value: the diameter of the circle formed by the tire screws, the unit is mm, domestic cars are usually 100, 114.3, European cars are more special, including 98 of the Love Express series, 108 of Volvo, 120 of BMW and M. Benz's 112.
4. Center hole: It is used to ensure that the geometric center of the rim coincides with the geometric center of the hub, so that the steering wheel will not vibrate when the vehicle is running at high speed. 5. Geometric centerline: The most important reference data of the rim, including calculating the Offset value, the net distance from the fender, etc., must refer to this value. Wheel rim and tire (Wheel rim, Tire) 1. Tire Tread refers to the part of the tire surface that is in contact with the ground. In order to prevent slipping and heat dissipation, there are many patterns on the tire surface.
2. Tubeless tire The tire is not equipped with an inner tube and the tire itself has an inner tube structure, and the air is filled in the tire. It has been widely used at present to replace the wheel with an inner tube. 3. The inner tube (Tire Tube) is made of high-quality rubber, filled with air to support the weight of the vehicle, and fitted inside the outer tire. At present, it is seldom used in cars, but it is still commonly used in large passenger and truck vehicles. 4. Tire size The tire size is printed on the tire sidewall, and there are two ways to express it, such as 34*7 or 7.50-20.
The former is a high pressure tire and the latter is a low pressure tire. There are also many marks, such as D for light cars, F for medium cars, G for standard cars, H, L, and J for large luxury and high-performance cars. 1. The same wheel size usually refers to the diameter of the wheel hub, and the unit is inches.
2. The wheels of small vehicles are generally between 14 and 20 inches. For example, BYD F0 is equipped with 14-inch wheels, Ford F350 is equipped with 20-inch wheels, and Porsche 911GT3, as a sports car, is also equipped with 20-inch wheels. 3. Why do the wheels of the F350 look much larger than those of the 911? This also involves the issue of tire aspect ratio. Simply put, SUV tires are wider and thicker, while sports car tires are thinner. One more thing to add is that you can see that the tire usually has something like 205/65R16205 is the tire width 65 is the tire height R is the radial tire (now the car is generally radial) 16 is the size of the steel ring (The size of the steel ring is as many inches as the back) There are marks on the tire: three numbers/R16, 17, 18 are the size of the wheel 1. In order to ensure safety and reliability to the greatest extent, no matter how old the car is Always check the hubs - watch out for early warning signs of wear: including any grinding noise when turning or abnormal deceleration of the suspension combination wheels when cornering.
2. If you hear the noise from the hub bearing, first of all, it is important to find the location where the noise occurs. There are lots of moving parts that could be generating noise, or some rotating parts making contact with non-rotating parts. If it is confirmed that the noise is in the bearings, the bearings may be damaged and need to be replaced.
3. Because the working conditions of the front wheel hub causing bearing failure on both sides are similar, even if only one bearing is broken, it is recommended to replace it in pairs. 4. Hub bearings are sensitive, and in any case, correct methods and suitable tools are required. In the process of storage, transportation and installation, the parts of the bearing must not be damaged.
Some bearings require greater pressure to press in, so special tools are required. Be sure to refer to the car manufacturer's manual.