RockyMtnT4R
New member
I may be wrong, but it seems that all of those who mentioned rubbing the UCA are also running JBAs? In fairness they are also the only manufacture that I have seen list maximum tire sizes and backspace information. Based on the information a 285 mounted on a OEM Trail wheel is 15mm or 0.6" closer to the UCA than they recommend.
Tire Specs:
Please Note: 32.5" and larger diameter tires need aftermarket wheels with less then factory wheel back space. Tire Size Calculator
LT285/70R17 (32.7" x 11.2") tire on 17 x 9 wheel, -12mm offset (4.50" backspace)
LT285/70R17 (32.7" x 11.2") tire on 17 x 8.5 wheel, -9mm offset (4.30" backspace)
LT285/70R17 (32.7" x 11.2") tire on 17 x 8.5 wheel, 0mm offset (4.75" backspace)
LT285/75R16 (32.8" x 11") tire on 16 x 9 wheel, -19mm offset (4.25" backspace)
LT255/85R16 (33.10" x 10") tire on 16 x 8 wheel, -12mm offset (4" backspace)
LT315/70R17 (34.4" x 12.4") tire on 17 x 9 wheel, -25mm offset (4.00" backspace)
Any tire that is 32.2" diameter and smaller there is no fitment problem.
Please Note: 32.5" and larger diameter tires need aftermarket wheels with less then factory wheel back space. Tire Size Calculator
LT285/70R17 (32.7" x 11.2") tire on 17 x 9 wheel, -12mm offset (4.50" backspace)
LT285/70R17 (32.7" x 11.2") tire on 17 x 8.5 wheel, -9mm offset (4.30" backspace)
LT285/70R17 (32.7" x 11.2") tire on 17 x 8.5 wheel, 0mm offset (4.75" backspace)
LT285/75R16 (32.8" x 11") tire on 16 x 9 wheel, -19mm offset (4.25" backspace)
LT255/85R16 (33.10" x 10") tire on 16 x 8 wheel, -12mm offset (4" backspace)
LT315/70R17 (34.4" x 12.4") tire on 17 x 9 wheel, -25mm offset (4.00" backspace)
Any tire that is 32.2" diameter and smaller there is no fitment problem.
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