I'm looking for a calculator that can tell me how wheel offset or, backspacing, varies as we increase tire diameter. Can anyone refer me to a website with online calculators or better yet paper references. If anyone that reads this post knows the relationships answer away!
I'm trying to select my new wheels & tires and need to make sure I retain (or remain close to) the OEM relationship between wheel offset and tire size to keep the loads on the unit bearings and ball joints similar to those observed in the OEM configuration.
The line drawn through the ball joint centers extends away from the vehicle as you raise the vehicle. In order to counteract the outward movement of this line I think the BS/offset should become smaller or, less positive, as you raise an XJ if you want to retain the OEM suspension geometry. Is this relationship linear?
Most of the wheel offsets for the XJ wheels I've surveyed appear to emphasize bad suspension geometry. With the 215/75R15 tire and 15x7 wheel we use 5.25" Backspacing/31.75 mm offset.
The open space under the front wheel house is inward toward the coil spring. However, in the rear my 235/75R15 gives ~1" of space between the inner sidewall of the tire and the leaf spring pack.
Please advise.
Thanks,
Rick
I'm trying to select my new wheels & tires and need to make sure I retain (or remain close to) the OEM relationship between wheel offset and tire size to keep the loads on the unit bearings and ball joints similar to those observed in the OEM configuration.
The line drawn through the ball joint centers extends away from the vehicle as you raise the vehicle. In order to counteract the outward movement of this line I think the BS/offset should become smaller or, less positive, as you raise an XJ if you want to retain the OEM suspension geometry. Is this relationship linear?
Most of the wheel offsets for the XJ wheels I've surveyed appear to emphasize bad suspension geometry. With the 215/75R15 tire and 15x7 wheel we use 5.25" Backspacing/31.75 mm offset.
The open space under the front wheel house is inward toward the coil spring. However, in the rear my 235/75R15 gives ~1" of space between the inner sidewall of the tire and the leaf spring pack.
Please advise.
Thanks,
Rick