Originally Posted by Gloade16
Getting a 3 inch procomp lift put on my truck with UAC's, and deciding on tire size. Anyone know what size i could run without trimming? 17 inch wheels, heard people can run 285/70/17 with no rubbing but also heard that people are rubbing with this size as well.
Pictures would be appreciated!!
Every 285/70/R17 is different in size. That said I had to do quite a bit of plastic cutting, metal trimming, mud flap removal and cab mount chop to fit 285/70R17 Nitto Trail Grapplers on 17x9 4.5" BS wheels -13mm offset.
I guarantee you, without a doubt, you cannot run 285/70R17 without trimming. Noone can. If they say they don't rub I GUARANTEE you they are lying. I had to cut quite a bit of metal and ripped off one of my rear fender flares offroading. I had to add a Ubolt flip and axle relocation plates to get the rear to clear with stock bumps.
ABOVE is PRE axle relocate plate and Ubolt flip...
ABOVE is POST cab mount chop and trimming with minimal compression... needed to set caster to over 3 degrees to clear.
ABOVE is the very start of my trimming...
You will need a cab mount chop, then cut the plastic and the black liner plastic I am holding up to and including that bottom lip below that bolt above my finger. You need to cut back the sheet metal there so its almost even with the cab mount chop then roll the lip. You need to pound the pinch weld FLAT up to thatupper cut I made in the plastic there.
ABOVE metal mount for the mud flaps cut out and the edge folded over. You can see how the tire sweeps through that area when turning and arcing side to side, especially under compression.
ABOVE you can see how you need to cut back the black liner to expose the pinch weld... it must go from sticking out into the wheel well at a 90 degree angle to being FLAT, not just folded over gently, but FLAT. Requires extensive use of a full sized sledgehammer.
With UCA that add caster by moving the UCA BACK to add 2 degrees you move the tire BACK as well meaning you compound rubbing issuus. I had PERFECT 2.5 degree caster but the wheel was too far rearward and was rubbing... had to get max caster which was over 3 degrees to get the tire to clear my cab mount POST CHOP. This first alignment was NOT ENOUGH.
Remember that 3" and lesser lifts (non drop bracket and non spindle lifts) DO NOT change rubbing... only how much compression is needed till it rubs. DO NOT let some asshat tell you that a 3" lift will "fit 285s without rubbing." Its going to rub and you need to do what is necessary to stop the rubbing. Its not rocket science. Its not difficult. It does take some tools and elbow grease and about 5 rounds of trimming bit by bit till you get a perfect, rub free fit. I was very pissed off because I listened to so many people say this would be easy as pie... it is not.