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Old 07-29-2010, 11:33 PM   #1
Join Date: Jun 2010
Posts: 9
noob need JK help

Hey all, I finally got my 2010 rubicon, Saturday putting on TF 2.5" Budget Boost and got the hook up from Sis in law on some 35x12.5 pro comp Xterrains.... only thing is they are for 15" wheel. Gonna go with Carger soft 8's 15x8....unless anyone recomends different. Does any one know if this will fit okay or am I gonna need to modifiy, if so what will need to change? Spacers needed? how thick? or is grinding the caliper a good solution? I have read many guys do it

All input welcome...just looking for info that might help any problems go easier. Thanks

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Old 07-30-2010, 12:08 AM   #2
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Join Date: Apr 2010
Location: northeast ohio
Posts: 2,274
as it seems you already know, 15" wheels don't fit on JK's. they seem to be hit and miss. there are many theories as to why this is ranging from the front axle, to caliper and wheel tolerances.

I've experimented on my own Jeep with this. the conclusion I've come down to is it's a backspace issue. normally for 35's, you'd want 4-4.5" backspace on a 12.5" tire. well, at 4", it becomes 50/50 if they'll hit the calipers. my solution? I maxed out the BS. I successfully fit 15" rims on my JK with 35's running a 3.75" backspace. I work part time at a 4x4 shop, and have replicated the same results. I have yet to see a 15" rim with a BS of 3.75 hit the calipers.

if you have 4" or more and it rubs, you may grind the calipers without issue. just remove small amounts of material at a time with a sander. generally 2 passes gets it done.

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Old 07-30-2010, 12:24 AM   #3
Join Date: Jun 2010
Posts: 9
Thanks groundhawg, I guess I was looking for reassurance to go ahead and do it just handle what comes up but if I do the 3.75"BS insted of the 4" I might be good to go.
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Old 07-30-2010, 12:48 AM   #4
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Join Date: Apr 2010
Location: northeast ohio
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sure thing. 15's with 35's are great. even if you need to grind a little, you'll be happy with the look. soft 8'a I think only go down to a 4" BS with a 15x8, but I could be wrong on that. I'm running 15x8 ProComp Rock Krawlers and they look almost identical to the 8's, but go down to a 3.75" BS.

with that BS, my 35's stick out about 2" from under the fenders, so be careful with laws and such as not all states allow it. some folks like the tires in the fender too so just a heads up...they will stick out a little.

they are out just a bit. if you're interested in the Rock Crawler wheels, I have a photo in my Jeep Profile of them with the tires, no center caps, mounted with stock lugs.
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