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Wait - don't over compensate in aspect ratio based on a sports car's ride. That would be a big mistake.
The difference between the size you're looking at and the stock size of 215/55-17 would actually result in a decrease in sidewall height (measurement between the road and the rim) and that's the opposite of what you're saying you want to achieve. Not only that - the other differences are greater diameter, greater circumference and so forth.
The result of going with your suggested size would result not only in the speedometer and odometer being off by more than 3% (the speedo would indicate just over 57mph @ 60mph), the change would have negative efffect on shift points, suspension geometry, turning radius, (probably) body rub, and braking distance. Matter of fact, as I entered the two tire sizes into a calculator - your suggested tire size actually triggered a warning that said anything over a 3% increase in circumference would have negative effect on braking.
My recommendation would be to concentrate on selecting the right type of tire. There are lots of good tires specifically made for touring cars like the Avalon. Go research those and let us know how it worked out for ya!
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2007 Avalon Limited - Love this car!
Last edited by Tom in Tacoma; 03-25-2011 at 10:47 AM.
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