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Re:What tyre psi you running???

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28 Jul 2020 09:52 #225775 by Phattaff
Running 235/75/15s not sure what pressure they should be.
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28 Jul 2020 10:31 #225776 by mlines
Replied by mlines on topic What tyre psi you running???
20 psi for me

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses

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28 Jul 2020 12:16 #225777 by 300bhpton
On road, off road, towing, hauling, type of tyre, type of driving?

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28 Jul 2020 13:51 #225781 by Lambert
The tyre will have a maximum load at a maximum pressure written on the sidewalls. Either using the maximum axle weights off the vin or actually measuring the weight on each axle you can use maths to work out the pressure from the maximum figures on the tyre.

Dreadnaught (black 2011)

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28 Jul 2020 15:10 #225787 by jackonlyjack
22 psi all four 195/80/16 extreme retreads
Same in bfg km2 225/75/16

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28 Jul 2020 19:54 #225797 by Busta
Replied by Busta on topic What tyre psi you running???
I run 21psi in 215/75r15s. 19-20psi would seem about right for 235s.

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28 Jul 2020 20:27 - 28 Jul 2020 20:29 #225802 by GeorgeC

Lambert wrote: The tyre will have a maximum load at a maximum pressure written on the side-walls.
Either using the maximum axle weights off the vin or actually measuring the weight on each axle you can use maths to work out the pressure from the maximum figures on the tyre.

Well said Lambert! Also the tyre manufacturer can give you another number than will confirm all the above, its the Static Loaded Radius. I quote from an email from Bridgestone for the stock Gen 4 195 80R 15 Tyre: "Static Loaded Radius = 315mm +6, -10."

For my Jimny I have settled on 22psi for left front & rear and 22.5psi for right front & rear, at 4 degrees C, no TPMS. I have yet to measure the Static Loaded Radius at these pressures.
Last edit: 28 Jul 2020 20:29 by GeorgeC.

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29 Jul 2020 09:49 #225815 by Phattaff
Cheers all for your input. Some very tech answers there, as I'm a bit stupid i will go for 21 front and 22 rear

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29 Jul 2020 11:08 #225818 by Roger Fairclough
To GeorgeC

Why are you running different tyre pressures left to right?

Roger

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29 Jul 2020 11:28 #225819 by saxj
Replied by saxj on topic What tyre psi you running???

mlines wrote: 20 psi for me


I also run 20PSI on road. 9 off-road

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29 Jul 2020 19:54 #225833 by GeorgeC

Roger Fairclough wrote: To GeorgeC: Why are you running different tyre pressures left to right? Roger

A good question. There is more weight over the right side of the car than the left with only the driver + fuel. This will be confirmed later when I measure the Static Loaded Radius of all four wheels.

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30 Jul 2020 21:38 #225873 by Jezz
Replied by Jezz on topic What tyre psi you running???
About 6 or 7 psi for me.

It's been fettled just a tad.

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