↓ Advertise on Defender2 ↓

Home > Technical > Low ground pressure tyre set up
Post Reply  Down to end
Page 1 of 1
Print this entire topic · 
defender_uk



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

Scotland 
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
Post #741221 19th Nov 2018 11:30am
View user's profile Send private message View poster's gallery Reply with quote
Cupboard



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

United Kingdom 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.
Post #741227 19th Nov 2018 12:22pm
View user's profile Send private message View poster's gallery Reply with quote
c18rch



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

United Kingdom 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
Post #741232 19th Nov 2018 12:59pm
View user's profile Send private message View poster's gallery Reply with quote
Cupboard



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

United Kingdom 2011 Defender 110 Puma 2.4 HT Corris Grey
Quote:
Not sure you meant that sort of low pressure did you?


Low pressure is low pressure Laughing

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.
Post #741259 19th Nov 2018 4:05pm
View user's profile Send private message View poster's gallery Reply with quote
mrd1990



Member Since: 16 Aug 2012
Location: Wales
Posts: 598

Wales 2000 Defender 110 Td5 CSW Epsom Green
Just a quick side-note, low pressure means the rims could be damage if you hit rock or pothole too hard. Thumbs Up
Post #741335 19th Nov 2018 9:14pm
View user's profile Send private message View poster's gallery Reply with quote
Dieseljock



Member Since: 03 Jun 2017
Location: Inverclyde
Posts: 31

Scotland 2003 Defender 90 Td5 HT Zambezi Silver
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
Post #741384 19th Nov 2018 11:51pm
View user's profile Send private message View poster's gallery Reply with quote
c18rch



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

United Kingdom 1988 Defender 110 200 Tdi HT Keswick Green
Cupboard wrote:
Quote:
Not sure you meant that sort of low pressure did you?


Low pressure is low pressure Laughing

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 Wink

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
Post #741426 20th Nov 2018 10:29am
View user's profile Send private message View poster's gallery Reply with quote
OsloBlue



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

United Kingdom 2003 Defender 110 Td5 XS CSW Oslo Blue
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
Post #741432 20th Nov 2018 11:15am
View user's profile Send private message View poster's gallery Reply with quote
defender_uk



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

Scotland 
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
Post #741528 20th Nov 2018 11:13pm
View user's profile Send private message View poster's gallery Reply with quote
jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7664

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 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop
Post #741542 21st Nov 2018 8:37am
View user's profile Send private message View poster's gallery Reply with quote
Supacat



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

United Kingdom 2013 Defender 110 Puma 2.2 XS DCPU Keswick Green
This might work:


Click image to enlarge
Post #940014 29th Jan 2022 12:36pm
View user's profile Send private message View poster's gallery Post Reply
Post Reply  Back to top
Page 1 of 1
All times are GMT

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
DEFENDER2.NET RSS Feed - All Forums