R36 wheel upgrade

[GHW]

thanks for that

Double thanks, I've told my fitter what's required, good info!

[SharifE]

The dealer told me its NOT a true pressure measuring system on these cars but instead measures over a period of time in a straight line if the wheel rotations are not the same via the wheel sensor and then reports an error.

Does anyone know if this is true or not?

sorry to say this, but most sales people dont have a clue

[3Putt]

Its all in the valves!

I've seen the valves in person, when changing to new wheels myself, and they are a big unit - not cheap to replace / buy either.

The main part sits on the inside of the rim, so the valve looks pretty normal from the outside.

Problems arise with aftermarket wheels when their shape (on the inside) does not allow the big sensing unit to sit flush (and thus airtight). Its a matter of trial and error.

You have to be prepared to ditch the TPMS if the wheels you choose are the wrong shape or somehow don't have room on the inside.

Lots of tyre places are very badly educated (if at all) on the subject of these fancy valves. You have to be very careful because these things are easily damaged - the threads especially.

Make sure your tyre fitter at least has seen a few TPMS systems before.