There are many different styles of aluminum rings on the market, which is really dazzling, but there are many points to pay attention to when replacing aluminum rings. From the most obvious appearance, although it is easy, the difference between aluminum rings is not only in appearance, but the most often overlooked basic setting value of the original factory is the most important link.
1, rim offset (offset value): this value is the value from the center of the rim cross section to the fixed datum plane of the screw hole, generally RV is positive, and a few vehicles and some jeeps are negative. For example, if the offset value of a car is ET40, if it is replaced by ET45 aluminum ring, it will shrink into the wheel arch more than the original iron ring. This design is related to the steering characteristics of the vehicle and the wheel positioning angle. Factory settings are usually optimized. A large offset value of the clearance may lead to abnormal tire wear, easy bearing wear, and even out of control when the tire bursts at high speed. Don't be careless
2.PCD value and hole position: hole position refers to the number of nuts locked when the rim is fixed, generally 4 holes or 5 holes. The PCD value is the diameter of the circle formed by connecting these holes, so some rims may have drilled eight holes to adapt to two different PCD values.
3. Diameter inch and J number: this item is also related to the appearance, and usually goes to the next level (for example, 14 "upgrade 15"), which does not hinder the original acceleration, but is helpful for handling, road feeling and visual effect of appearance. If you skip a grade, you need to think about it. Although it is better in some aspects, it is accelerated because of the improvement of rolling quality. On the other hand, if you only change the aluminum ring without upgrading the number of inches, it is obviously helpful to speed up. J number represents the English number of rim width. Generally speaking, it is not enough to directly use the J number (5.5J) of the original iron ring to match the tires with upgraded tire width. Therefore, when choosing aluminum rims, if you intend to change the tire width, you must first choose rims with larger J numbers (for example, 6.5J, 7J) to avoid the dilemma of big feet wearing small shoes in the future.