Biggest tire with stock wheel well.

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ROLL-GMC

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Getting some 10" rims for the track, and trying to figure out what's the biggest tire I can squeeze in the stock wheel well without clearance issue. I run a Boss 338 18" for the street and it's a 9.5 rim with 305/45/18, and have no issues, have about an inch on the inside of wheel well, and the same for the fender lip, which I rolled slightly for the 338's, I believe it was a little more positive offset on the 338.
the truck is a RCSB style, 1996. Looking at a set of Hoosiers, and I'm thinking a 30-31" tire 10.50 or 11.50. I think the wheel well is a good 13" or so. The truck has a 4/6 static drop, also, lol! Any experience would be greatly appreciated. TIA.
 

ROLL-GMC

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Dev93 has a good wheel fitment display that is very helpful. Looking for tire size.
 
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