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I just did some additional research and all of the tires in stock sizes but one on Tire Rack had the 99 rating !
Are you going to a different (smaller size) tire or a different speed rating? If yes to either of these, I would not approve.
For stock C5 wheels I'm considering the following tires (Kumho MX's, Wideovals, or something else under $600/set) Sizes: 255-40-17 (instead of stock 245-45-17). Rears: 285-35-18 (instead of stock 275-40-18).
How does that sound? Anyone done that? (Just trying to add a lil width here)
There needs to be at least 0.5 inches difference between the front and rear (rear larger) for the active handling and traction control systems to work properly. Stock has 1 inch difference. Tire Rack should have height of theses tires.