i've just bought a e34 saloon with what i think is m5 wheels.



but i'm unsure on correct tyre size. also mine doesn't have the little m badges so maybe mine are replicas?

i've done a bit of research on the net and found conflicting advice, some saying 245-40-18 tire for the front and 265-35-18 for the rear, others advising 245-40-18 all round.

i'm on 235-40-18 atm and the tyres rub, hence why i'm looking into this.

any views fellow passionbmw'ers? also tyre pressures on a 525 m50 saloon?