Tyre pressures!

Technical Advice, Faults and How-To Information.
Pacemaker1000
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Post by Pacemaker1000 »

I know the recommended psi is 37.
But spec on my 275/35/19 and 245/40/19 tyres is recommending 35psi?

Believe it’s the same for 20’s
Last edited by Pacemaker1000 on Sat Jul 10, 2021 12:20 am, edited 2 times in total.

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Lunar
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Post by Lunar »

If I’ve caught up with all the posts you’re on Nexen right?
Where did you get that max pressure “spec” from.
If you post photos of the spec and of your rear tyre I’m sure we can advise.
At the moment a first post like that can’t get a proper reply.
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Pacemaker1000
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Post by Pacemaker1000 »

Yeh sorry got that wrong it’s not the max figure, I’ve edited it. If you google just the tyre spec it advises 35psi is correct for car weight.
I’ve read most use between 32-37.
I’ve put mine at 36 which rises to 38 when hot. Find when hot car is more comfortable due to flex in rubber I assume
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scm
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Post by scm »

So to clarify, you're saying Nexen recommends 35 psi and Jaguar recommends 37 psi?
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simpleR
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Post by simpleR »

What are these Nexan things we speak of?

The 20" on my V6 call for 37psi. I believe the quoted psi are cold figures.

These are set when cold and when nice and hot the rears run at 41 or 42 and the fronts 39 to 40.
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Pacemaker1000
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Post by Pacemaker1000 »

I believe pressures are calculated by manufacturers using vehicle weight and it’s distribution. I’m thinking as Jag have the same all round pressures weight is virtually 50 50. However, with the introduction of the P300 that must have changed as car is nearly 250kg lighter. So logic dictates this should be changed?
There are charts showing this and for the lighter car it gives a psi of 35.

Anal but interesting ...lol
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PhilB
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Post by PhilB »

Find the tyre pressure sticker on your car.
Find your wheel/tyre size and set the pressures to what the sticker says.
Fez
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Post by Fez »

PhilB is correct, not sure why you would want to deviate from the recommended pressures for road use...
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Jaguandy
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Post by Jaguandy »

Recommended tyre pressure is usually a compromise between comfort, traction, heat, cornering and wear. If you favour some aspects over others, you can change the pressure.
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Pacemaker1000
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Post by Pacemaker1000 »

Jaguandy wrote: Sat Jul 10, 2021 10:22 am Recommended tyre pressure is usually a compromise between comfort, traction, heat, cornering and wear. If you favour some aspects over others, you can change the pressure.
agreed
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