Home > Technical > Low ground pressure tyre set up |
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Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971 |
How low a pressure are you talking about?
I've run the factory steel wheels with 7.50R16 tyres at 0.8 bar (12PSI) which is pretty low. Substantually lower than that and you'd run the risk of taking the tyre off the rim. The only solution to that is beadlock wheels but there aren't many that are road legal. |
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19th Nov 2018 12:22pm |
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c18rch Member Since: 28 Nov 2012 Location: Sheffield Posts: 28 |
Not sure you meant that sort of low pressure did you?
I think he means minimal impact on the ground itself. I have a 110 that I run with kumho kl71 33x12.5 at about 28 PSI all the time. Unless it is really boggy they don't damage the ground. Mine is set up for minimal ground impact, because I have to be careful about damaging the land over which I shoot (golf courses, estate gardens, fussy farmers etc) Biggest issues with the vehicle would be clearance on the arches etc. I haven't noticed any effect on mine with respect to wheel bearing life, and the running gear can certainly cope unless you are driving it aggressively (which I suspect is the opposite of what you'd be doing given your objective). You could certainly go bigger and wider with the right suspension and wheel offset which would give you more flotation. You'll have to flare the wheel arches to meet MoT requirements if you go for a wider tyre. The problem you'll have with going for more flotation, is that you'll start to loose traction more easily. I have lockers fitted to mine now, but it wasn't too bad with just the standard set up before with these tyres. It definitely has less ground impact now with the lockers fitted as you are less prone to spinning a wheel and tearing things up. 1988 110 200TDi Hard Top |
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19th Nov 2018 12:59pm |
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Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971 |
Low pressure is low pressure With the same pressure supporting the same load you'll have the same contact area (therefore flotation), ignoring sidewall strength. The width of the tyre primarily defines the shape of the contact patch. |
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19th Nov 2018 4:05pm |
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mrd1990 Member Since: 16 Aug 2012 Location: Wales Posts: 600 |
Just a quick side-note, low pressure means the rims could be damage if you hit rock or pothole too hard.
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19th Nov 2018 9:14pm |
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Dieseljock Member Since: 03 Jun 2017 Location: Inverclyde Posts: 31 |
Hi wheels from an atmp supacat fit the defender hubs, we had a customer who had them fitted for lgp fertliser spreading.
Click image to enlarge |
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19th Nov 2018 11:51pm |
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c18rch Member Since: 28 Nov 2012 Location: Sheffield Posts: 28 |
I know I know I could reduce the tyre pressures I run to reduce the ground pressure too, but I spend all my time alternating between road and field and can't be bothered letting them down to pump them back up again. At 28PSI the tyres I run don't print on the ground unless it is so boggy that walking on the ground would do the same. 1988 110 200TDi Hard Top |
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20th Nov 2018 10:29am |
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OsloBlue Member Since: 14 Jul 2018 Location: Essex Posts: 822 |
I've seen a supacat ATMP and an argocat for sale on ebay recently. haven't seen one for years, do the army still use them? https://www.ebay.co.uk/itm/Argocat-8x8-Con...4902.l9144 https://www.ebay.co.uk/itm/Argocat-8x8-Con...4902.l9144 I'm on IG: https://www.instagram.com/osloblue42/ Current: TD5 '110 "Lucinda" Thread here: https://www.defender2.net/forum/topic62562.html |
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20th Nov 2018 11:15am |
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defender_uk Member Since: 12 Aug 2011 Location: SW Scotland Posts: 197 |
Many thanks for the replies. Good ideas there and food for thought. Thank you 2020 First Ed 110.
replaced by 2021 250 110 Commercial Defender_uk |
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20th Nov 2018 11:13pm |
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jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7979 |
personally 255 width at 22-26psi would prob do all you need. if it needs more than that take a tractor. 18psi is the 'token' drop to without bead locks and keep on the bead. Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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21st Nov 2018 8:37am |
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Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018 |
This might work:
Click image to enlarge |
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29th Jan 2022 12:36pm |
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