[Poison32]

The time has come to replace the runflats and I am going to put normal tyres on the thing is that I will be buying new alloys in the next month or 2 and my mate has a mint set of tyres off his old alloys but the rears are 245/40/17 would these fit on the rear as mines are 255/40/17 and can I reuse the tpms valve

Cheers poison

[rhysh1990]

Im pretty sure there are no tpms valves rather the car detects an imbalance via the abs/esp system?

[Digitalize]

If you have iDrive and your car displays actual pressures, you have sensors. It's highly unlikely though, the majority just measure a difference between rotational speed via the ABS.

[Poison32]

Cheers guys now I understand now just need to now if 245s will fit on the rear

[M4rius]

Yes they will fit.