[quote=Malek@MRF;12636973]You cannot run KW Clubsports with any offset of less than 20mm on the front. Anything less aggressive than 20mm, the wheel/tire will jam right into the coilover body. /QUOTE]
This sounds more like an issue with the lower spring perch/spring touching the tire and not the actual strut tube itself. It's a very common problem on BMW's to have the lower spring perch set too low resulting in a significant loss of inner strut tube clearance. If the tender springs on the clubsports are removed, then the spring perch could be run higher allowing for the needed clearance to fit ET25.
far too commonly overlooked issue.