W220 and 20" Fitment
-Will 10" wheels fit, or should he go with 9"? Not looking to roll fenders, get spacers, or do anything extra to avoid rubbing.
-Recommended offsets for 9" and 10" rims.
-Tire size recommendations.
Thanks.
Spacer: I think adding one is a better choice for 20" even though someone might think spacer is bad.
Tire: Luke is the expert at Tirerack and he shall answer better.
BTW, do you mind to tell us which wheel your friend is getting so anyone in this forum can answer your question more easily.


