Dreaded Run Flats / 326M alloys

[willgill]

According to Ocean BMW the last time the RFTs were replaced at Sytner (not by me) the TPS was calibrated.

I'm not sure if the e89's TPS is based on rotational reduction or internal pressure, either way it should have pinged up regardless, the tyres were totally flat.

Apart from the dealer calibration, were you also manually resetting the TPMS every time you fill your tyres? If not the tyres won't be set to the correct pressure.

Never touched the tyres aside from a visual inspection for tread, probably done less than 1000 miles since I bought the car certainly never added any air to them. I can't think of any car I've owned that I've had to constantly add air too, what are you doing to warrant that?

 

[mr wilks]

According to Ocean BMW the last time the RFTs were replaced at Sytner (not by me) the TPS was calibrated.

I'm not sure if the e89's TPS is based on rotational reduction or internal pressure, either way it should have pinged up regardless, the tyres were totally flat.

Apart from the dealer calibration, were you also manually resetting the TPMS every time you fill your tyres? If not the tyres won't be set to the correct pressure.

Never touched the tyres aside from a visual inspection for tread, probably done less than 1000 miles since I bought the car certainly never added any air to them. I can't think of any car I've owned that I've had to constantly add air too, what are you doing to warrant that?

So in your 1000 miles you never once checked all 4 tyre pressures other than visually :?
There is so little sidewall its very easy to have 3 tyres correctly pressured & 1 running say 15Psi ?
As i understand it you can reset the TPMS with 4 differing pressures & only if one of those 4 alters will it ping so you could well have covered your 1000miles whilst the tyre was technically running flat hence the outcome you pictured

 

[Smartbear]

My previous Dec 2010 was by rotation the Sept 2016 has a tpms system - I don't know when tpms was introduced.

My Sep 13 car is also rotational & not pressure.
Rob

 

[willgill]

Apart from the dealer calibration, were you also manually resetting the TPMS every time you fill your tyres? If not the tyres won't be set to the correct pressure.

Never touched the tyres aside from a visual inspection for tread, probably done less than 1000 miles since I bought the car certainly never added any air to them. I can't think of any car I've owned that I've had to constantly add air too, what are you doing to warrant that?

So in your 1000 miles you never once checked all 4 tyre pressures other than visually :?
There is so little sidewall its very easy to have 3 tyres correctly pressured & 1 running say 15Psi ?
As i understand it you can reset the TPMS with 4 differing pressures & only if one of those 4 alters will it ping so you could well have covered your 1000miles whilst the tyre was technically running flat hence the outcome you pictured

In the past I've probably knocked up 2k+ a week and aside from visual review I'd no more think about checking the tyre pressures than flying to the moon, granted most of the cars I owned had independent pressure monitors on them which should have pinged up any issues, but still it's not something I've done since the heady days of driving to cornwall as a young lad.

Onto the tpms discussion, when you reset it each sensor has its own value recorded and a drop of pressure (or rotation if you have a newer system) would ping an alarm for any and all tyres independently. So it will record one flat tyre after another until you replace them or they all go flat. It's not a one size fails all setup

I ordered four replacement sensors because the garage the car got stranded at didnt have an inpa/sss setup to read each value (they were just a hunter specialist)

End of the day I'm glad to see the back of the RFTs, utter garbage tyres. However, maybe I'll change my dependence on technology in the future.

 

[mr wilks]

I understand what you say above willgill but its possible (prior to your purchase ) the car had its TPMS reset when 3 tyres were ok & 1 wasn't :? Therefore no triggering would have occurred even though one could well have been running on low pressure for the 1000miles :?

 

[ronk]

If it had tpms it's nothing more than a couple of button pushes and a short drive to check and reset tyre pressures.

On Mrs K's car the good quality pressure gauge i have, reads 2.6 on all four - but shows two on the car system at 2.5

I don't think slow drops in pressure will make the system ping !