Winter tires bleed air...anybody else

Winter tires bleed air...anybody else

I’m running Pirelli Scorpion 275 45 r20 on Tesla Sportline Rims.

At anything above about 35° I don’t have any problems.

As soon as the temperature gets below that they start to lose air like crazy. For example I will fill them up to 40 PSI and then a day later many of them are too low and one was as low as 26 PSI!

Obviously not optimal for going up to the ski hill.

Firestone has looked at them but the tires never leaked when they were at the shop.

Anybody got any ideas? | 14. Januar 2020

Maybe hard to find someone with those specific tires and rims and in freezing weather. You might contact Sportline to see if they know anything unusual about their rims. Sounds like all four tires have the issue, so it's either a design problem with the tires or the rims or the combination. Sorry, that's not very helpful.

ElectricSteve | 09. Februar 2020

Are these the first tires on these rims or had these rims have other tires mounted on them in the past?

stuart | 25. Februar 2020

Was it much warmer when you filled them to 40 and then down to 35F when the low pressure was indicated? Cold weather causes the pressure to drop. Always has. No one ever noticed it before tire pressure warning systems. My garage is warmed to 50F. I fill my tires at that temperature and then drive outside where the temp is in the 20s and I get tire pressure warnings. Pressure is back up when the tires are warm.

If you tire pressure does not come back up as the air temperature increases then you my have a problem. If it does then the temporary solution is to fill your tires when it is cold, but they will be overpressure when it is warm outside.

liftsrock | 26. Februar 2020

stuart explains this correctly. Tire pressures are directly related to ambient air temperature and thus the tire internal air pressure. In cold weather, I find that my tire pressures increase after driving a few miles which heats up the air inside them. If you have this issue with only one tire, then you could have something as simple as a valve stem with a loose valve in it and you can purchase an inexpensive tire valve tool (similar to a screw driver) and tighten it, or you could have a problem with the bead of the tire not seating against the wheel and Tesla Service Center or a tire shop could check this out for you and remount the tire on the rim if necessary. Lastly, you could have a small nail / screw somewhere in the tread that is difficult to see. During cold weather, I often set my tire pressures display to show on the screen and I check to see if the pressures increase to normal after driving a few miles.