RE71rs in that size will rub the liners on a M2C lowered 20mm as the tire shoulders are quite square. Spacers I run are 10/5mm.
Heat gun for the liners and a slight trim from the rear bumper support tab is required.
I reckon with street tires clearance will be ok but haven't tested personally.
Maybe this thread will help
Increasing tire size from 245/265 to 255/275: any cons ?
https://f87.bimmerpost.com/forums/sh....php?t=1468422