Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: lefty on April 21, 2006, 12:43:10 PM

Title: Tyre Pressure calculator
Post by: lefty on April 21, 2006, 12:43:10 PM

I'm sure I remember seeing  a thread somewhere that explained how to calculate tyre pressures with vehicle weight, tyre size etc etc.

I've treid seraching for it but to no avail  :(

Failing that, can anyone with 31x10.5 MT's on their XJ tell me what pressures they're using?

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Post by: AdrianW on April 21, 2006, 01:00:01 PM

You need to know the weight of your Jeep loaded. Sidewall of the tyre will have a rating of Max Load =x at y psi

Divide x by the weight of your Jeep, then divide by 4 to get the loading on each tyre, then multiply by y to get correct psi.

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Post by: Anonymous on April 21, 2006, 01:01:10 PM

stuff all that..... :wink:

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Post by: AdrianW on April 21, 2006, 01:01:56 PM

So do I  

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Post by: lefty on April 21, 2006, 01:02:52 PM

i've got mine at about 32 at the moment and usually take em down to about 20 offroad... those were guesses though, based purely on how they looked to be deforming!

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Post by: chrisjones on April 21, 2006, 01:08:04 PM

I run mine at 33psi.

Again, t'was a bit of a guestimate though.

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Post by: Mike Pavelin on April 21, 2006, 01:26:44 PM

Used to run at 33 but found them a bit bumpy. 30 is about right.

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Post by: Mort on April 21, 2006, 01:32:23 PM

Here's one of the many threads on JeepClub which gives the formula - http://http://www.jeepclub.co.uk/topic.cfm?ID=3083