Can anyone tell me if ET is the same as IS (see example below)? I have seen some BMW wheels advertised that have offsets descibed differently for front and rear, but although they look otherwise okay for Z4, I'm a bit worried about the fact that is says IS 50 and not ET 50. I've never come accross IS before.
Front 8 J x 18 ET 47 Rear 8.5 J X 18 IS 50
Scorp.
Front 8 J x 18 ET 47 Rear 8.5 J X 18 IS 50
Scorp.