[ROBWIL]

I think I know what the problem is.
I set my winter tyres to the correct presure on the car pillar.
I decideed to check the tyre pressure the dealer set on car tyers.
They were set at 40psi and should have been 36psi.
It showes you can't trust a garage to do a profesional job.

 

[bassek]

That's rather high, 40psi is 2.75 bar. When the temperature rises the pressure rises too, so it'sosmething to take into account when filling up winter tyres. My problem is that the pressure goes down in -20C. My winter tires got spikes...
The pressure gauges in garages are often calibrated way off. I noted up to 5 psi or 0.5 bar differences.

 

[BioTeq]

2.7 bar is actually fine - I had the dealer check my pressure and they went with 2.7. It allows a relatively even wear on the tyres.
Even with 2.7 in the front I have a far stronger wear on the edges than what should be happening. Had to change both of them after only 30k km.