Quote:
Originally Posted by Bönz
The front would be okay as the overall diameter difference between 245/35 and 255/35 is negligible at about 7mm. I do not think the additional 5mm width to the inside will rub as others have made this change.
The rear, however, is not good. Going from a 30 to 35 series with a 275 width increases diameter by over an inch (27mm). This will throw off your speed about 4% at 50km/h, but more importantly reduce the amount of torque you put down on the road by the same 4%. If you don't care about these things, I think it will fit, but your performance will suffer.
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^^ This
However, the standard rear tire of 640i coupe is 245/45/18 so the total diameter of rear wheel is 26.68" . with new tire (275/35/20) your total diameter would be 27.57" which is 0.9" or 3.3% larger than the standard wheel...
Your front tire is also 1.2% larger than standard which is negligible...