The stock size is 245/50/16 for plain Z28's and Firebirds. The SS and WS6 cars have the 275/40/17 on 17x9.5 wheels. You can run 315/35/17 on 17x11 wheels on the rear but you most likely have to trim the bumpstops like I did and you might need to center the rear with an adjustable panhard bar or hammer in the inner fender if it rubs a little. I just needed to trim the bumpstops and my 315's fit fine.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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