What is the offset of the wheels as that will be your most important issue.
Minimum width on adapters will be 20mm, so you have to take 20mm off the et of the actual wheel to know what et you will be running.
ie: if the bmw wheels are et 34 .. 20mm adapters .. so you are running 8s with an actual et of 14
oh and adapters shouldl not ruin the hubs
