Car tyre keeps losing air pressure

Apples2

I have the same issue on my 530D. I thought it was the tyre but after a replacement tyre was fitted, exactly the same.

My Runflats have gone in favour of normals, just got to source a replacement wheel.

facade

If you do change the tyres & wheels (good idea, runflats need special equipment to change, and are very expensive) you must inform your insurer of the change, to give them a chance to raise your premium, otherwise they can refuse to pay out, and even try to recover any third party losses from you.

Apples2

Agree with the statement but mine didn't class it as a modification nor did they charge anything. They just put a note on file to record my call to them

mattyprice4004

Excellent bit of engineering from BMW if alloys just crack! Never had any trouble from the 30-40 alloys I've had spread across other cars, usually between 10 and 15 years old.

Jamie_Carter

mattyprice4004 wrote: »

Excellent bit of engineering from BMW if alloys just crack! Never had any trouble from the 30-40 alloys I've had spread across other cars, usually between 10 and 15 years old.

It's more likely to happen on wider wheels with very low profile tyres, where they take more stress and have less protection from the tyres.

Norman_Castle

http://www.bbc.co.uk/watchdog/consumer_advice/bmw_latest.shtml

Years ago I had a leaking alloy wheel. The alloy had become porous. Looked like a puncture in the rim when under water. Fixed with a hammer and punch.

SteveJW

Someone posted earlier, worse in cold weather

I had a problem on an old Ford many years ago, salty water off the road, when they had been gritting got between the bead and the rim, corrosion started (the white fluffy stuff you get on alloys) sufficient to slightly unseal the rim

mattyprice4004

Jamie_Carter wrote: »

It's more likely to happen on wider wheels with very low profile tyres, where they take more stress and have less protection from the tyres.

True, I'm not sure what profile the BMW wheels and tyres affected are but one of mine was an MG ZT with 18" alloys with 40 profile tyres, and another was a ZS with 17" alloys with 45 profile tyres. Didn't have any issues and I took the ZT around a Land Rover offroad course at one point! That was painful lol.

I bet runflats don't help.