I'd reccomend staying with the same overall height tire to keep your speedometer correct. I am upgrading to a 17" wheel on my '93 2wd and used this page...
...to stay near my factory overall tire height. Enter the factory size on the left (mine was 175/75/14) and then a new size on the right to see how the stack up. A shorter tire will make your speedo read faster than you're going. A taller tire will make your speedo read slower than you're going. Good luck.
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2003 Nissan 350Z 11000 mi
1993 Nissan Truck 133,000k mi
1999 Mercury Mountaineer 55kmi
1966 Ford Mustang 2many k mi
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