Under inflated run flats

[CSK423]

I've just swapped my wheels out for winters (yes probably too early but the car will be parked up for the next few weeks due to work) and noticed that the 3 original tyres (1 was swapped 6 months ago due to a puncture) that have came off the car have worn severely on the inside shoulders to the point where some slight cord is showing at 2 or 3 points round the tyre. The worst tyres are the rears.

It looks as if they are under inflated but are running 33psi rear 31psi front which is what the car came with from new. Also the wear is not even round the inside of the tyre it almost bulges slightly if that make sense. All rims are round inside and out and I haven't had any wobbles.

I've done just over 26.5k miles and the rears are just over 2 mm the front just over 3mm. I'm quiet happy with how long they've lasted I'm just wondering why they've give up the ghost on the inside shoulders and why it's so uneven almost as if in parts the runflat has collapsed.

Anyone came across this before ?

[CSK423]

2015 640d GC. pressures are 2.2 and 2.4 bar on the door which is around 32psi and 34psi for the 20" wheels.

[CSK423]

[CSK423]

Ninja59 said:

Your pressures are to low for a start 20's on the 640 should be 35 front 38 rear.

Inside tyre wear is common you can dial out some of the factory camber on the rear to reduce the wear, front you cannot alter. The camber is the problem here but bmw like it to make it more sporty.

I picked up on this aswell but this is for a loaded car, 95% of the time it's me on my own however the 2.2 (32) and 2.4(34) I listed above is for a car with 3 people (or whatever the symbol is) on the door pillar.


I think I'll flick my local dealer an email with the pics and gather their thoughts......which will be a £100 wheel alignment no doubt !

Thanks for the responses.