I have 255/60's on my 15x7 rallys, great tire wear too! In fact,I'm getting ready to try 275/60's on in the next few days, as it appears I will have room after my 1 inch suspension drop in the back. Just as an FYI, I have 285/75/16 on my stock Suburban alloys, they're 7 inch as well.
I run Dunlop GT Qualifier T 255/60R15 on my 15 x 7" Weld Rims with 4.5" backspacing, plenty of clearance, next time I will try 275/60R15. They are safe to run, look at the specs from the tire manufacturer, it says 7" minimum.
Now there is one other option thats even bigger!!!
Mickey Thompson Indy Profile 1074* H50-15 295/50-15
Yes, 295/50-15 !!! They DO FIT!! See picture below on my 69 Camaro. They rubbed though when people were in the back seat (Hotchkis 1 1/2 in. drop Leafs), nothing damaging or visible, just a very slight inner fender rub on a 4.5" backspaced rim. A thin spacer probably would have fixed that problem. Tread width is 10"!!LINK to INDY PROFILE
If switching to 16" I would recommend going with at least 8" rims in the rear so you can run 275 on the back. You would have to use the specs listed at tirerack.com for 16" tires to see if any 275's will fit on a 7" if you wanted to go 7", but with less sidewall, its harder for the tire to bulge away from the rim.
A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. Come join the discussion about performance, builds, restoration, modifications, classifieds, troubleshooting, reviews, and more!