The 635 has 8.5j 17" ET13 with 225/45-17's all round.
I want 8.5j 17" ET20 with the above tyres fitted.
The vendor reckons any tyre bigger than 215/40-17 will arch rub. I've got 15-20mm to play with before that hits. Using your speedy wheel fittin brains, tell me... what the heck will happen?
In the meantime, I'll try and work it out this end.