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I have 315's on the rear and I love em. Don't care what anyone says they look awesome. Plus if you pull to close to a curb it gets the tire, not the rim. 285s would look good too. The wider the better
285's will fit on the 9" and even better on the 9.5". As far as the speedo being off. You have a tire thats roughly 25.97" tall rather that 25.66" tall.
Half an inch won't through it off.