LCR Tyre Pressures (General tyre pressures)

[CJRamze]

Hi All.
Last night I thought I'd check my tyre pressures. Last month I had a flat tyre thanks to a wayward screw DIRECTLY in the middle of it and sadly I didn't notice until it was too late, Thankfully the only thing ruined was the tyre itself.

Ever since I've been super paranoid and I keep getting out of the car to look at the tyres to make sure it bothers me that much. They seem fine, they look a little compressed but coming from a Ibiza Cupra with Toyos that was the norm.

Hooked it up to the machine last night after driving about... 1 mile at 50-70mph (To warm the tyres up a tiny little bit) hooked it up to the machine

First tyre reads 23, Second 24, third 10... 4th 24...
I find it strange that they all read around the 23-25 region especially considering as the fuel cap says 33PSI unloaded (Or with minimal load)

What are your tyres reading at the moment? Does the it vary this much in the weather?
What should the LCR's be, should it be 33 like it says on the fuel cap?
I'm running stock tyres and I'm starting to wonder if someones f***ing with my car maybe intentionally placing sharp objects or letting the tyres down at night.

It wouldn't suprise me the scum I live near...
I had the machine checked by a random passer by and his read perfectly so I'm "Pretty" sure its not the machine but you can never be 100%

 

[TubbyTwo]

i run 34 to 35 all round in mine, but have let them down a bit for the snow, so prob around the 30psi mark.

Cold weather seems to make mine drop really quickly.

 

[DPJ]

Gay-Lussac's law:

The pressure of a gas of fixed mass and fixed volume is directly proportional to the gas's absolute temperature.

 

[jimbob99]

im pretty used to "soft" cars like bmw audis etc so the 32psi i normally run felt a bit too hard in the LCR crashing into potholes etc so i tired it at 28 and i quite like it now, handle ok too, mind you are shitty autogrips so they were never going to be great

 

[CJRamze]

Gay-Lussac's law:

The pressure of a gas of fixed mass and fixed volume is directly proportional to the gas's absolute temperature.

Colder surroundings lowers PSI in tyres?

 

[skahigh]

Colder surroundings lowers PSI in tyres?

Hence why you are supposed to measure your tyre pressures when the tyres are cold so that you can be consistently sure about the pressure.

 

[traumapat]

The rule of thumb is that for every 10°F drop, 1 psi is lost.

The above was nicked off another forum but gives an idea.

Everything gets smaller in the cold

 

[jamie1]

Everything gets smaller in the cold

Lol

 

[DPJ]

Colder surroundings lowers PSI in tyres?

Yes.

 

[CJRamze]

I wonder how they work out the "correct" tyre pressure then, Do they have a set standard so

33PSI @ 12C

 

[DPJ]

I think you'd take 'cold' average temperature as being around 15-18 degrees C. Every 1 degree change affects pressure by 0.3 psi, I think.

 

[leoncupratdi150]

i would get that third tyre with a psi of 10 checked...could be a slow puncture...if you keep driving it at a low pressure you will knacker up the side wall of the tyre causing it to bubble and if left....blow out

 

[skahigh]

i would get that third tyre with a psi of 10 checked...could be a slow puncture...if you keep driving it at a low pressure you will knacker up the side wall of the tyre causing it to bubble and if left....blow out

Ye, I had exactly this recently, found 3 nails in it! Still havnt had time to get a new tyre put on the spare...