[rasa bmw]

Originally Posted by Roadrebel

That sounds high. Maybe that's why the tyres wear in the middle.

You should reset the system as it works on the rolling radius of the tyre which will have changed.

thats factory spec according to manual

[therealdb1]

Originally Posted by Roadrebel

That sounds high. Maybe that's why the tyres wear in the middle.

You should reset the system as it works on the rolling radius of the tyre which will have changed.

Yes the pressures are high because the sidewalls are so low. My 30 profile tyres look flat all the time even with 38 psi in them. If the pressure were lower we would have even more welded up cracked alloys on eBay

Roadrebel is right though, Rasa, you should reset the TPMS system every time you inflate the tyres so that it knows what "normal pressure" is and it looks for changes in the ABS signal. The later systems with pressure transducers inside the tyre are more clever and give an actual pressure for each wheel.

[rasa bmw]

Originally Posted by therealdb1

Yes the pressures are high because the sidewalls are so low. My 30 profile tyres look flat all the time even with 38 psi in them. If the pressure were lower we would have even more welded up cracked alloys on eBay

Roadrebel is right though, Rasa, you should reset the TPMS system every time you inflate the tyres so that it knows what "normal pressure" is and it looks for changes in the ABS signal. The later systems with pressure transducers inside the tyre are more clever and give an actual pressure for each wheel.

yeh will have a look at weekend when next in the car..actually tomorrow as mot time..