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defender_uk

Member Since: 12 Aug 2011
Location: SW Scotland
Posts: 197

Low ground pressure tyre set up

Looking for info .
Looking at an old land rover to do general dogs body around the farm Need it to traverse wetish land. Therefore wondering about low pressure wheels . Anybody any info on that or have already done that? What issue might there be on running gear and wheel bearings etc. Vehicle will still have to be road legal.

In summary: Am I looking at a white wheel? with road legal floatation tyres?

Thanks. 2020 First Ed 110.

replaced by 2021 250 110 Commercial

Defender_uk

19th Nov 2018 11:30am

Cupboard

Member Since: 21 Mar 2014
Location: Suffolk
Posts: 2971

2011 Defender 110 Puma 2.4 HT Corris Grey

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.

19th Nov 2018 12:22pm

c18rch

Member Since: 28 Nov 2012
Location: Sheffield
Posts: 28

1988 Defender 110 200 Tdi HT Keswick Green

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

19th Nov 2018 12:59pm

Cupboard

Member Since: 21 Mar 2014
Location: Suffolk
Posts: 2971

Quote:
Not sure you meant that sort of low pressure did you?

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.

19th Nov 2018 4:05pm

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.

19th Nov 2018 9:14pm

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

19th Nov 2018 11:51pm

c18rch

Member Since: 28 Nov 2012
Location: Sheffield
Posts: 28

Cupboard wrote:
Quote:
Not sure you meant that sort of low pressure did you?

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.

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

20th Nov 2018 10:29am

OsloBlue

Member Since: 14 Jul 2018
Location: Essex
Posts: 822

Dieseljock wrote:
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

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

20th Nov 2018 11:15am

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

20th Nov 2018 11:13pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7979

2011 Defender 110 Puma 2.4 USW Stornoway Grey

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

21st Nov 2018 8:37am

Supacat

Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

2013 Defender 110 Puma 2.2 XS DCPU Keswick Green

This might work:

Click image to enlarge

29th Jan 2022 12:36pm

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