I've been looking for ages to pick up a 17" X 8" wheel as a spare as for some reason I have a genuine 18" Alpina as a spare, and what with the 'Ring trip would prefer to have a 17" so if I do have to use it for a prolonged time I needn't concern myself with differing overall diameter.
I've been looking on eBay for ages with no luck - anyone got a spare spare so to speak???
Also, HOW bad is it for the rear diff to run a 255/40/17 on one side and a 235/40/18 on the other? I've had to do it before but not for long, would the journey from the 'Ring to Amsterdam like that result in a knackered rear diff?