Probably silly question about max tyre pressures

Probably silly question about max tyre pressures

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Discussion

maurice28

Original Poster:

12 posts

32 months

Friday 6th December 2024
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I've just had all-season tyres put on my EV. The recommended pressures, according to the car door sticker, is 39psi. The tyre fitter had only inflated them to about 33psi, so I've topped them up. In doing so, I noticed the max pressure listed on the tyre is 44psi.

I'm aware that during driving, my 39psi tyres will potentially go above 44psi when they warm up - is this a problem, or does that 44psi max figure refer to how much you should inflate when cool, and they tyre can handle higher pressures during actual driving?

RazerSauber

2,600 posts

69 months

Friday 6th December 2024
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I'd be surprised if your tyre pressures went up that much when warm but you'll have no problems. I wouldn't worry about it.

maurice28

Original Poster:

12 posts

32 months

Friday 6th December 2024
quotequote all
Great, thank you!

5s Alive

2,273 posts

43 months

Friday 6th December 2024
quotequote all
It's a valid question though, depending on where, and how you drive.
Here in bonny Scotland I run my tyres at 37psi, one above the recommended 36. Set recently at 10° ambient they go up to 38/39 during a 26 mile A road trip. In our lukewarm summer they reached the heady heights of 39/41.

However, many years ago on a trip to the south of France in our e28 5 series it started to feel like we were driving on concrete tyres. Wasn't far off... after several hours of 90mph they were at 50psi having started at 32psi in Edinburgh. Outside temperature was 40°+ and the tyres were too hot to touch!