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Quote:

Originally Posted by BonzoHansen (Post 401594)

No, that is the aspect ratio. Your sidewall is 45% of the section width of your tire (ie 215, etc.).

OD = Overall diameter

http://www.1010tires.com/TireSizeCal...?action=submit

For instance, my 77 has 245/60/15 tires, which have an OD of 26.57"
A 215/45/18 (making up a size) is 25.61"

What ever tire size you buy really needs to be +/-2% of your stock tire.

Thanks for the calculator. I think I'm good. My stock tires are actually 215/45/18. I was looking at a set of Dunlop Winter Sport 3Ds at 215/55/16, which comes to an OD of 25.31.

im running cooper zeon sport all seasons in the rear right now. it was getting to the point where i was stuck with only an inch on the ground with my 315's on the rear...