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Old 10-12-2012, 11:56 AM
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DirtyDan DirtyDan is offline
Officially Welcomed to the 'Fest
Location: Ohio
Join Date: Jan 2011
Posts: 170
Mein Auto: 2003 X5 3.0i
I am not sure if you want to change tire size since all the computer calculations mpg etc and transmission are based on the overall size of the tire. here is a site that calculates the difference

What I did was keep the 235/65/17 for the winter and upgraded to a factory BMW sport set of 19" staggard wheels/tires. 255/50/19 front and 285/45/19. It makes it look tough but rides rougher.
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