I am kinda new here myself, but let me put in my $0.02 worth! I have never done a study on the largest possible tire for a stock and lowered PT but I do know that the lower the aspect ratio the tire has the harder the ride will be. My Turbo 03 Gt Cruiser has 17" tires all around and 205X50 Goodyear RSA tires. It rides great a little firm but great and handles better than I expected and I expect a lot. So I know you can go bigger than that with safety. Do check with the folks at Tire Rack they are very good people!
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