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I have a 2012 with Tech package - tires are 255-55-18. Anybody know the largest size tire that will fit on a stock rim?
 

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Go to www dot tirerack dot com

enter your current info

after you click on any tire, you can scroll down to "specs" and see all of the numbers.

height and rim width are important, moreso the height.
 

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It's not just a matter of what the largest size will fit on the rim, but what will still allow clearance with regard to wheel openings, suspension components, etc. Just because a tire will fit the rim doesn't mean it will work on the car. Maybe it would help if you would explain what you are trying to accomplish.
 

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Although 265/60R18 fits fine, but it is about 1.5 larger. Speedometer reads 60mph, actual speed is 63mph+. The scrub radius is negative -6. This may affect handling. The steering is probably lighter when turn left or right.

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