Quote:
Originally Posted by fshubert
Well, that's what Tire Rack told me. The could have told me "no" and I woulda bought another $1700 worth of wheels/tires and put the E90 set in Roundel "for sale" section. But Tire Rack says the 225/45/17's I bought last year for my old 2009 E90 335i will fit the new 2013 F30 335i. I guess I'll find out for sure in early December.  |
They'll fit, probably. But this is NOT a valid -1 sizing. In fact, your speedometer will read 4% slow. The standing height of the F30's standard 225/45R18 size is 25.972441".
The standing height of a 225/45R17 size is 24.972441", or 4.4% less.
The standing height of a 225/50R17 size (the correct -1 package for an F30 with standard 225/45R18 tires) is 25.858268" or a very small difference of .44% less.
The formula, BTW, to calculate the correct standing height is:
Standing height = ( ( (width x decimal aspect ratio) / 25.4) * 2 ) + inside diameter of tire