Wheel Backspacing?
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Senior User
Joined: Jan 2005
Posts: 205
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From: Tucson
Wheel Backspacing?
I am currently running 16.5x9.75 Weld Racing Typhoons, wrapped with 37x12.50 PJ's. The PJ's only rub on the passenger side spring. The welds backspacing is 4 5/8" Is that too much or too little back spacing? I have heard that 4 1/2" is ideal. Also what would cause it to only rub on one spring? On another note, the drivers side rubs on the fender when I'm tweaking it.
Could I have "twisted" the suspension? I did find that after my last serious off-roading trip that my rear shocks had dents in them on the shock body! Looked like it hit the spring packs!!! HAHA
Could I have "twisted" the suspension? I did find that after my last serious off-roading trip that my rear shocks had dents in them on the shock body! Looked like it hit the spring packs!!! HAHA
Last edited by hc130flyboy; May 22, 2005 at 11:08 PM.
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Joined: Jun 2004
Posts: 2,646
Likes: 1
From: Milky Way Galaxy
The lower the backspacing number, the more your tire will be pushed out from the axle. So a rim with 4 1/2" backspacing will be less likely to rub on the spring than the 4 5/8" backspaced wheel. Backspacing is the measurement from the rear of the rim to the mounting surface. If you didn't already know what the backspacing was you could lay the rim face down on the ground, place a straight edge across the surface and measure down to the back of the mounting surface and that would be the rims backspacing. The rubbing from your tire (one side, not the other) could be anything from something having been thrown out of whack on one of your adventures, i.e. alignment, bent spring, etc, to simple manufacturing and assembly tollerence differences, one spring was mounted differently, a steering stop is slightly longer on one side, etc. These might not have been noticeable with stock tires and rims, but with those PJ's and Welds, things are a little tighter and rub a little. Or it could be just what you think, too much backspacing on the rim. Somehow I get the feeling that this explanation was about as useful as a football bat. Hopefully not.
