LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

backspacing and bolt circle for skinnies

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Old 05-19-2003, 11:43 AM
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backspacing and bolt circle for skinnies

i'm ordering 15X4 convo pros and can not remember what the measurements are...anyone help???
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Old 05-19-2003, 12:45 PM
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5 lugs on 4.75" circle.

My Weld Pro-Star 15x3.5's run a 1.75" BS. Your 15x4's should be at least 2" BS. Might even go to 2.5" if it is available, to tuck the tires into the fenders a little. Mine are too close to the outside edge of the fender.

I don't think the Convo-Pro's require a spacer to clear the brake pad clips and caliper support bar, but you might want to verify. I know the Welds require a 5/16" spacer, which contributes to the outside of the tire being too close to the fender line.
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Old 05-19-2003, 08:55 PM
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thanks....the convo pros don't require spacers, which was a huge part in the decision to go with those.

Thanks again for the measurements
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