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Tyre pressure alert this morning - all values the same?

VanillaAir_UK

Well-Known Member
Jun 17, 2019
8,743
6,308
Surrey, UK
I got some DeWalt cordless tools and probably a few too many batteries. So I bought the DeWalt compressor and just reuse a spare batteries that I change when I swap the winter/summer tyres - it can also work from 12v at below the continuous 'fuse' rating. I've used it to inflate (smaller than Tesla tyres) from scratch and no issues. It gets a full workout twice a year when I swap winter/summer and is pretty much spot on with the TPMS. A quality piece of kit but at a price. I certainly would not want to be buying it and a battery. The only down side is its quite big and slides around in the boot in its box.

I paid £105. Its slightly gone up in price.
 

VanillaAir_UK

Well-Known Member
Jun 17, 2019
8,743
6,308
Surrey, UK
What is the correct psi for the newer cars. Early M3's was 42, but I am sure that I read somewhere that the additional test range came partly from tyre pressure change - 45psi? ie what is written on the sticker on inside of passenger door frame and whilst anyone is looking, what is the max occupant and cargo weight and what car/wheel spec do you have?
 

Irata

Member
Oct 16, 2020
587
353
UK
What is the correct psi for the newer cars. Early M3's was 42, but I am sure that I read somewhere that the additional test range came partly from tyre pressure change - 45psi? ie what is written on the sticker on inside of passenger door frame and whilst anyone is looking, what is the max occupant and cargo weight and what car/wheel spec do you have?

42psi on the sticker on my LR 2021 refresh model, with WLTP of 360 miles.

Max combined weight of occupants and cargo is 375kg

Wheels are 18", so 235/45 R18.
 

GeorgeSymonds

Active Member
Mar 16, 2018
1,450
1,061
UK
Mine were at 44/45 when I picked it up in June.

Currently at 40 all round and not had any alerts yet.
Alerts are more to signify a leak than to tell you it’s time I top the tyres up. In your case it’s already time to increase the pressures (assuming you’re 42psi like most of the wheel sizes).
 
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Nick77

Deep Blue Model 3 LR (2021 MIC)
Mar 15, 2020
510
211
Burton-on-Trent
Alerts are more to signify a leak than to tell you it’s time I top the tyres up. In your case it’s already time to increase the pressures (assuming you’re 42psi like most of the wheel sizes).
They don't look or feel low. They're probably a bit comfier too.

I assume it slightly increases range though.
 

AMP_it_up

Member
Apr 25, 2020
36
29
Oxford, England
I don't believe the TPMS is that accurate, at least on my 2019 M3P. I used to note that the tyre pressure reading was lowish, e.g.39, 40 psi, when they start giving a reading within the first couple of miles. However when I checked the pressure with my TUV approved tyre gauge the pressures were bang on 42 psi, which is what I manually set them at. I also used to get substantial differences in the pressures between different wheels.

I have found the way to get more accurate readings and less variation is to manually set the tyre pressures when they are cold to the desired pressure, making sure there is no direct sun on any of the wheels which will heat them up and raise their pressure, then do a reset and go for a drive. I believe the reset process takes a reading of the pressure at that point and equates it to 42 psi, but I may be wrong!
 

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