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Thread: L322 20" tyre pressure when off-roading

  1. #1
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    L322 20" tyre pressure when off-roading

    Hi all,

    Took my 2010 SC V8 offroading for the first time over the Easter weekend and boy she was lovely :-)

    I aired down to ostensibly 20 psi but my TPMS read 19.x psi.

    Anyways when doing some.. umm.. more challenging offroading with some really deep ruts and side-wall action (as much as you can on 20" rims) one of the tires temporarily came off its bead and it lost 12 psi in a matter of seconds, I had to hobble back to base on 7 psi.

    So out of curiousity what tire pressure do others use on their 20" tires when off-roading? Keep in mind that with the SC V8 20" (if you want any choice of tires) is about as small as you can go.

    I upped the pressure to 22/23 psi for the next outing and didn't have anymore issues but by the same token didn't try the same track.

    Thanks!

  2. #2
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    The track in question:



    The end result (she lost all air-pressure on the slow drive back so I had to swap to the spare to get back to camp):

    20190419_121949.jpg

    Also not sure why that image is being rotated incorrectly :-|

  3. #3
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    I've heard that airing down on low profile tyres is a bad thing. It's not worth the risk to the sidewalls and doesn't give you much benefit as it would if you had high sidewalls.

    I'm not a massive off roader so I could be wrong. But it sounds reasonable to me.
    04 L322 Vogue V8 - Work truck
    07 Freelander 2 TD4 SE - The wifes
    74 Leyland P76 Targa Florio - Aspen Green
    91 Kawasaki GPZ900R


    Previous LRs = 78IIa series - 81, 93, 95 RRC - D2V8

  4. #4
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    What were the conditions for which you felt reduced pressures were required? I would only reduce pressures for sand and very steep rock climbing if traction wasn't adequate at normal pressures.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
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  5. #5
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    New to this type of off-roading, I'm used to driving my Defender off-road and the adage that you always lowered your tire pressures. Didn't think driving on 40psi would be suitable, even on 20" tires.

    Happy to be corrected though, taking the L322 off-road is a new experience for me.

  6. #6
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    ive gone gone down to 16psi on sand on my 20's.
    running 285/50R20.

    for non sand work, 24psi should be fine.

  7. #7
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    I'm on 18" and don't go below 27 psi now after damaging two tyres and completely destroying a third when on 22psi. Admittedly these were standard ATs and not LT rated, so had soft sidewalls. My trips are mostly in the Vic high country, some of the tracks can be prettu tough. Have just come back from 4 days around the Cobberas wildness, had a ball and no damage this time.
    20 psi is, IMHO, for tyres with much bigger sidewalls.

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