a hub main Definition
Size
hub size is actually the hub diameter, commonly known as 15-inch wheels, 16-inch wheels is the wheel size (diameter). Generally in the car, wheel size large, flat tire is high, then the visual tension can play a very good effect, but also an increase in the stability control of the vehicle, but the attendant is increased fuel consumption such additional problems.
width
hub width is also commonly known as J values, the hub width directly affects the selection of the tire, the same tire sizes, different value of J, selected tire flat width ratio is different .
PCD and holes
PCD professional name is the pitch circle diameter refers to the diameter between the hub central fixing bolt, in general the hub large porous spaces 5 bolts and four bolts, but also the distance the bolt are different, so we can hear 4X103,5X114.3,5X112 this often is called to 5X114.3 example, on behalf of the hub is PCD Zheke 114.3mm, five bolt holes. When choosing hub, PCD is one of the most important parameters for safety and stability, the best choice PCD is consistent with the original car’s wheels to be upgraded.
offset
offset (also called deviation or ET) is the distance from the mounting surface of the hub center line, can usually find this parameter on the back of the hub. Popular point that is modified after the hub projecting outwardly or retracted inwardly. For general sedan, ET is positive, a small number of vehicles and jeeps in terms of some negative.
central bore
the center hole is used part of the vehicle is fixedly connected, that is, the position of center of the hub and the hub concentric, where the diameter affects we install The hub can be ensured if the geometric center of the rim can beAnd the geometric center of the hub match (although the hub displacement can convert pitch, but the existence of such modification risk, users need to be cautious trial).
