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Gary@TireRack · 05-23-2008, 12:42 PM

A good rule of thumb is the tire section width changes .2" for every .5" difference in wheel width for the same size tire.

Example:

If a 225/40/18 is 8.9" wide on an 8" wheel it will be 9.1" on an 8.5" wheel or 8.7" on a 7.5" wheel.

05-23-2008, 12:42 PM	#18
Gary@TireRack Moderator 369 Rep 4,745 Posts Drives: Formerly 1995 M3 Join Date: Oct 2006 Location: South Bend, IN, Tire Rack HQ iTrader: (2)	A good rule of thumb is the tire section width changes .2" for every .5" difference in wheel width for the same size tire. Example: If a 225/40/18 is 8.9" wide on an 8" wheel it will be 9.1" on an 8.5" wheel or 8.7" on a 7.5" wheel. __________________ Gary. Tire and Wheel Forum Moderator. Tire Rack Sales Rep Gary@Tirerack.com http://www.tirerack.com/a.jsp?a=AH8&url=index.jsp Please refer to 'Gary/E90 Post' as your previous contact when you order online to help support this forum.
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