Novak Conversions Jeep Wrangler TJ radiator

BMB Question

I've been told that you can use the BMB 16" kit with a 15" rim if you have the right backspacing or wheel spacer. Is this correct? If so, what is the back spacing needed or wheel spacer size?
In general, 3.75-4" of back spacing will clear the caliper. It does depend on how the wheel is shaped internally so it isn't a hard and fast rule.
 
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Different wheels will have different clearances. On my initial install of the 16" BBK in a 15" wheel, the stick on balancing weights would rake across the caliper as the foam tape squished. I had to remove weights from the pathway of the caliper. Not long after, I changed to 17s for that and a half dozen other reasons.
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Novak Conversions Jeep Wrangler TJ radiator