Quote:
Originally Posted by williaty
It is a major problem. As Handsdown noted, bearings are made to take the load of the car on, or nearly on, center. As you screw up the offset, you form a lever that the load gets magnified along before reaching the bearing.
Assume, for a moment, that the factory wheels exert the load 5mm off the centerline of the bearing (it's actually probably less than this). Slap on those 30 offset wheels you talked about. You've just increased the lever between the bearing and the load from 5mm to 35mm, a factor of 7. So the load seen by the bearing is 7x whatever the bearing was designed to accept. Couple this with the fact that people who get improper-offset wheels tend to also run low and hard suspensions (which increase peak loads), and suddenly you're WAY above the design load for the bearing.
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Load or moment load on the bearings is increased by the square of the distance. For example; double the offset CL equals four times the load.
This is calculated from the centerline between the two taper roller bearings, not the offset from the hub.