What is the largest tire that will fit with a IRS...I know that a 275/40R17 will fit would a 315 R17 fit...I know that this tire will fit on a solid axle car with some frame modifications...thanks for the info...later....
largest tire with IRS
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315's will fit with some mods, check the NorCalCobras site for the mods as planned out by David Borden
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Our car is autocrossed a lot so the tires are running a bit of camber 
Our car started out as a live axel with a narrowed rear end....then was retrofit with IRS and then clearanced for 315's. We do run adjustable sway bars and shocks. The car handles like it is on rails!
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For pics of 315's on a straight IRS build see Jeff build page on our site.
http://www.norcal-cobras.com/fick/journal2.htm
Our car started out as a live axel with a narrowed rear end....then was retrofit with IRS and then clearanced for 315's. We do run adjustable sway bars and shocks. The car handles like it is on rails!
For pics of 315's on a straight IRS build see Jeff build page on our site.
http://www.norcal-cobras.com/fick/journal2.htm
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He is using quad shocks. No tire rub.
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