[RoundRound]

Hello,
I have an F30 330e 2017 with new 'go flat' tyres - MPS4.

Revently there's very hot wather in the UK (35c a lot for the UK) and I noticed that when I took the car to a short drive on the motorway today (around 30 miles? not much) the PSI in the fron tires reached 47(!), I keep ot at the spec 41 usually and the tire sidewall says don't inflate it to over 50.

Is this dangerious? What shoudl I do if I go on a long drive? let some air out of the tires (they'll be warm naturally).

Thank you!

[obert]

It’s normal. Set your tires at what the manufacturer says when cold and all will be good.

[RoundRound]

Originally Posted by obert

It’s normal. Set your tires at what the manufacturer says when cold and all will be good.

Thank you, I hope so.
Just worried that is I drove 300 miles instead of 30 the PSI could reach over 50 PSI... Also the manufactures presures assume runflat tyres, maybe go flats are different?

I realisethere are many far hotter places than the UK...

[Gen13 F36]

California here...weather is perfect
Go flat
Front 35 psi. After driving 36-37 psi
Rear 37 psi. After driving 39 psi

[obert]

Originally Posted by RoundRound

Thank you, I hope so.
Just worried that is I drove 300 miles instead of 30 the PSI could reach over 50 PSI... Also the manufactures presures assume runflat tyres, maybe go flats are different?

I realisethere are many far hotter places than the UK...

I know people have different preferences on tire pressure but for me 32lbs is what I run in normal tires and run flat tires. The only time I would run less is if I had a race car or off road vehicle while off reading for better traction.

[RoundRound]

Originally Posted by Gen13 F36

California here...weather is perfect
Go flat
Front 35 psi. After driving 36-37 psi
Rear 37 psi. After driving 39 psi

Yes,
A 2-3 PSI increase after a long drive is normal, I though I saw a 6 PSI increase - maybe that's a fluke

[IAmATeaf]

Is 41 really the recommended normal inflation pressure? Seems a bit high to me.

Not the same model but for my staggered setup I run at a max of 37 all round.

[RoundRound]

Originally Posted by IAmATeaf

Is 41 really the recommended normal inflation pressure? Seems a bit high to me.

Not the same model but for my staggered setup I run at a max of 37 all round.

These are the recomended pressures for my car - I have the staggered 18":

[Onizukachan]

The 50 max is cold pressure, don’t worry about it, Increase due to heat is already accounted for in the engineering of the tire.

I had the inverse problem, it was super hot and then cooled off when it started raining super heavily and the tires Cooled and dropped pressure so dramatically the TPMS threw a flat tire alert!