20x10.5 what offset to sit flush and not rub?

Im gonna take a look at some wheels possibly tomorrow and wanted to know what offset i would need to sit flush with a 10.5 wide wheel im new when it comes to this. Any ideas or suggestions im also lowered on eibach springs

It depends on what size and brand of tire you use. 10.5 ET45 is sort of a standard spec and depending on the exact tire you go with, you might be able to fit a 305/35/20. I have 20x10.5 ET45 and even 295/30/20 Michelin Pilot Supersports rubbed the top of the fender because they run extra fat. I settled on 285/35/20 Supersports and the they fit great but there are plenty of people running narrower tires like Nittos in 305 without rub.

I think some of the Shelby wheels are 10.5 ET 50 or 52, meaning you could definitely get away with a wider tire because that higher offset will sit the tire inside the fender more than the 45.

With a 10.5" wide wheel, you'll need an offset of about 55mm for it to sit flush and the tire not to contact the fender over bumps.

I've run several set-ups on my '13, same 305/35/20 tire fit perfectly when mounted on a 10"-wide wheel with 48mm offset, but they hit the fender when mounted on a 10"-wide wheel with a 40mm offset.

A half-inch (12.7mm) wider wheel will need to have at least 10mm more offset to fit similarly to the 10"-wide 48mm-offset wheel, with the same exact 305/35/20 tire.
One thing to also remember, that 305 tire will mount more square-shouldered on a 10.5"-wide wheel than on a 10"-wide wheel, so less sidewall bulge and more contact patch.

Thanks for the help! I just purchased a pair of str 607s from an 13 s197 owner and they sit perfectly!


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