Quote:
Originally Posted by kriszty
How to calculate the difference in % and is the wheel size important or only the tyre size?
i have a xdrive m240i, with default 7,5x18 and 8,x18 and 225/40 front and 245/35 rear.
if i buy new wheels 8x18 and 9x18 with the same tyre size (225/40 front and 245/35 rear), is that good?
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only tyre size is important. to calculate difference in % go here...
https://tiresize.com/comparison/
if you want to compare wheel diameter, width, offsets and tyres, go here...
https://www.willtheyfit.com/
225/40/18 & 245/35/18 is 1.2% difference from BMW
if your new wheels are 18x8 & 18x9, you can use your original tyres but i would use 225/40/18 & 255/35/18 OR 235/40/18 & 265/35/18 if their offsets permit.