Quote Originally Posted by MTechnik540i
Found an especially good deal on some 245/45-17" Potenzas and wondering if they'd fit alright on the 540i?

Factory sizing is 235/45-17, so i'm assuming it might knock the speedo up 1-2 mph at 60-70. Would I have any trouble clearing the strut/fender?
Avoid larger tyres - it not only ****s around with your speedo but also with your ABS system. Not to mention that you WILL have rubbing issues with larger tyres if you lowered your car.