Quote:
Originally Posted by LS1Hawk
When you say OD you mean the outside diameter which is the height of the sidewall, correct? My stock tires are 45.
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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.