Talking about GM Tech2 wheels data

Upgrade the hub is the first step of many to pursue  GM Tech2  personalized owners to create their own unique car, but in the face of numerous, but a wide variety of all kinds of wheels made a difficult, do not know where to start. In fact, as long as the little secret learned wheels behind, overwhelmed troubled swept away.
Rim diameter:
Popular talk is the wheel diameter, in inches. Between players playing rim converted pursue "big is beautiful" aesthetic philosophy, the large size of the wheels to bring a richer visual impact of the effect, while improving the overall texture of the vehicle. Aesthetics, the hub of the larger size also has a more practical role, not only can be installed flat tire than the lower improve vehicle handling, the brake system is able to accommodate the larger size to meet the higher braking demand . However, special attention is accompanied by large-size wheels usually comes greater quality.
Tire diameter and width:
The hub of the width of the rim, which represents the width of the hub unit of the same are in inches. Different tire diameter wide wheels need the corresponding install different width of the tire, such as 8 "to 225mm ~ 245mm tire width tires installed on the most appropriate.
Behind the tire diameter wide  Gm tech2 scan tool digital usually J, JJ English letters, which means that the shape and height of the hub flange, in addition to J, JJ, the height difference according to the hub flange, there JK, C, K, etc., C minimum, K is the highest. However, simple upgrade wheels, hub flange factors not require deliberate attention.
Offset:
That offset, also known as the ET value. Refers to the offset distance of the centerline of the mounting surface and the hub of the hub unit mm MM. Offset is divided into negative offset, offset 0, is offset three kinds, based on the distance of the hub-mounting surface and hub centerline to the outside direction as positive offset negative offset to the wheels inside of when The hub mounting surface with the centerline of the wheel hub coincidence, the offset is 0.
The hub offset distance is smaller, the larger the vehicle tread, but in the hub of the tire diameter width unchanged under the premise, a hub offset the smaller, the inside of the hub to accommodate the space of the braking system will be compressed accordingly smaller, this when you want to install the large size   Autel MaxiDAS DS708 of the brake system may be affected. In addition, inappropriate hub offset distance may also cause the hub tire and vehicle suspension systems, the fender movement interference occurs, is too large, the tread of the bearing load increase, the wheel alignment data anomalies and other adverse consequences.