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Thread: Tyre pressure how low to go.

  1. #1
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    Tyre pressure how low to go.

    As being new to the bigger 4x4 only had suzukis and still do. I'm heading off for a week or so fishing with the 110 and will be doing a lot of sand driving..I have no problem dropping the tyres down to 8 or 10 lb on the sierra in the heavy stuff it has 235/75. But the defender is a different story has stock 235/85 contis how low can you go, the L/R is a lot heavier than a 900 kl zook..thanks

  2. #2
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    i`ve gone as low as 12-14 psi in soft sand .. depends a bit how heavily loaded
    your 110 wil be ..

  3. #3
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    8psi is not uncommon where I go with my fender. you just have to be gentle.

  4. #4
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    dawsey,

    On sand I go down to 1 Bar (14 Psi) in the 90 wearing the General Grabbers. They have pretty stiff side walls but they have a nice long footprint per wheel. I was very impressed by their sand performance to be honest and they are marginally better than the KM2's which are inclined to dig a bit.

    As pushrod said unless you're carrying the kitchen sink and all, the 110 will breeze through it at 12 to 14 Psi.

    Just remember the 110 is just a little less forgiving on picking the right line and maintaining momentum in the soft stuff...

    Enjoy the trip!

    Cheers,

    Lou

  5. #5
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    Down at 1 bar (14PSI) and below you have to pretty careful not get the tyre off the rim. Any quick left/right steering ,or big ridges, and the tyre rolls off the rim. I had this in some very soft SA sandhills, and my little compressor had great trouble getting the tyre to inflate again. Couldn't get a good seal so the air just kept escaping. Ended up putting a ratchet strap around it to keep the edges out on the rim.....

    Will be interested to hear how you think a Defender compares to a Suzi in the sand!

  6. #6
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    as Spudboy said, keep above 100kpa, ( that is atmospheric pressure = pressure inside tyre), you can go lower with tubed tyres, but then risk sand getting in & a future leak. ( But easy enough to pop tubeless tyres back on with a can of butane )

  7. #7
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    Thanks for the info..thought Id pretty right keeping it around 15 and 20..Heading off at the end of the week, 2 weeks off going north, nowhere in particular will be the first time Ive taken it for a long run..Looking forward to comparing it on the beach to the suzuki..will let you know how she goes.Taken it through the local tracks just outa Perth. Handles the rocks and ruts a hell of a lot better than my sierra a lot less tippy .more stable and I love those coil springs.

  8. #8
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    Quote Originally Posted by goingbush View Post
    as Spudboy said, keep above 100kpa, ( that is atmospheric pressure = pressure inside tyre)
    No. The pressure reading on your guage is over and above ambient pressure.
    If the pressure inside the tyre really was equal to the pressure outside your car then your pressure guage would be reading approximately 101.3 KPa before you get it anywhere near the tyre valve.

  9. #9
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    Quote Originally Posted by RVR110 View Post
    No. The pressure reading on your guage is over and above ambient pressure.
    If the pressure inside the tyre really was equal to the pressure outside your car then your pressure guage would be reading approximately 101.3 KPa before you get it anywhere near the tyre valve.
    Depending of course upon the height above sea level of where you're measuring pressure....

  10. #10
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    Hi not sure whether the sand in WA. is that much different to the sand in SA .talking to the Ranger who drives the beaches every day , he said he runs 15/17 psi and doesn't have to many problems , however even he admits to geting stuck now and again . Carry some recovery gear ,plus a shovel !..good luck ..

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