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hugh_b

Member Since: 15 Sep 2010
Location: Kent
Posts: 75

Tyre pressure for defender 90 td5 with 235-85-16

Hi guy's, I currently have the standard general tr tyres fitted on my defender 90 csw. What are the correct tyre pressures for 235/85/16 tyres on a 90 (non loaded)?

My manual only gives tyre pressures for a different size tyre for the 90.

Thanks

Hugh

15th Dec 2010 8:59pm

Lorryman100

Member Since: 01 Oct 2010
Location: Here
Posts: 2686

There are a few posts on this subject, try a search

I run mine on a puma 110 at 30psi front and 35 psi in the rear empty up to 45 psi when towing.

15th Dec 2010 9:19pm

Zinke

Member Since: 27 Jan 2009
Location: Scunthorpe
Posts: 670

The correct pressures are 28 front and 38 rear but most people find these dont suit.

I run mine at 30 front and 35 rear most of the time changing to 28 front and 32 rear for greenlaning with no load and 30 front and 38 rear for towing long distances.

Pete.

15th Dec 2010 9:56pm

bm52

Member Since: 04 Apr 2010
Location: Kent
Posts: 2189

2014 Defender 110 Puma 2.2 XS CSW Havana

i tried loads of combinations on my 90 with both HD and standard suspension at the rear and with TRs and BFG ATs.

i have am now on the BFGs and with standard rear springs and prefer 30 front and 38 rear, 35 or less is a bit bouncy on the side walls.......

BM52

15th Dec 2010 11:22pm

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2420

2007 Defender 110 Puma 2.4 SW Chawton White

30 PSI ALL FOR DIRT ROADS
35 FRONT-38-REAR ON LONG TRAVELS IN THE HW FOR FUEL SAVING.

LOADED FOR ME ARE 4 PEOPLE AND CAMPING STUFF IN THE BACK.

OTHERWISE BOLTS AND TEETH START TO FALL DOWN. Puma 110" SW

.............................................................
Earth first. Other planets later

16th Dec 2010 8:53am

C90

Member Since: 19 Nov 2024
Location: Essex
Posts: 17

Thanks for the info here chaps, still useful after 14 years :thumbs-up:

Bumping it for anyone else looking.

25th Nov 2024 9:00am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20418

I use (PSi) 32F & 36R, that’s with 255/85/R16.
But I used to use the same with 235, if you tow heavy then you might want a bit more in the rear. $W33T $0U7H3RN $UG4R
🇬🇧🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁷󠁬󠁳󠁿🏴󠁧󠁢󠁳󠁣󠁴󠁿🇮🇪🇺🇸⛽️🛢️⚙️🧰💪

Last edited by custom90 on 25th Nov 2024 12:40pm. Edited 1 time in total

25th Nov 2024 10:27am

Bluest

Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4216

2007 Defender 110 Puma 2.4 XS CSW Java Black

I'm going to be the killjoy fun-police here, but I'd just caution against running pressures on the road substantially different than what the manual says. The factory pressures will have been chosen for a reason. Comfort is only one factor. Tyre life, handling, wet grip etc are all part of the mix. An issue introduced by running a different pressure may not become apparent until you have to make an emergency manoeuvre and could result in the car rolling rather than sliding, or under/oversteering when it shouldn't, aquaplaning/skidding more easily, heat build-up leading to tyre failure and so on.

I'm not saying you'll definitely die in a ball of fire and a couple of PSI here or there probably won't make any difference, but tyre pressures do play in important role in vehicle safety. 2007 110 TDCi Station Wagon XS

25th Nov 2024 11:19am

revd

Member Since: 20 Apr 2024
Location: England
Posts: 127

f28/r38 (BFG AT)

Ran with this for 200k miles- seemed to work just as well at 83mph on the autoroute and three up with camping gear, or solo on snowy tracks

25th Nov 2024 11:43am

Chicken Drumstick

Member Since: 17 Aug 2020
Location: Near MK
Posts: 751

Bluest wrote:
I'm going to be the killjoy fun-police here, but I'd just caution against running pressures on the road substantially different than what the manual says. The factory pressures will have been chosen for a reason. Comfort is only one factor. Tyre life, handling, wet grip etc are all part of the mix. An issue introduced by running a different pressure may not become apparent until you have to make an emergency manoeuvre and could result in the car rolling rather than sliding, or under/oversteering when it shouldn't, aquaplaning/skidding more easily, heat build-up leading to tyre failure and so on.

I'm not saying you'll definitely die in a ball of fire and a couple of PSI here or there probably won't make any difference, but tyre pressures do play in important role in vehicle safety.

Cobblers. If it was a 'real' issue, there would be legislation around it. And there isn't.

Sure a flat tyre is still a flat tyre. But there is a huge array of usable pressures depending on use, surface, driving style and the actual tyres you are running.

25th Nov 2024 1:57pm

TexasRover

Member Since: 24 Nov 2022
Location: Paris
Posts: 1078

2002 Defender 110 Td5 DCPU Chawton White

Not 100% sure but are things like tire pressure monitoring not becoming a requirement together with all the other nanny (making money) schemes.

The Governments are pushing all this technology out for safety and environmental reasons and the manufacturers are loving it.

25th Nov 2024 2:15pm

C90

Member Since: 19 Nov 2024
Location: Essex
Posts: 17

Bluest wrote:
I'm not saying you'll definitely die in a ball of fire

I was going to go with something along the lines of what Zinke is saying "30 front and 35 rear" which is very close to the factory recommendations - 28 front and 38 rear

I'm running Continental Cross Contact 235/85R16's on a 2007 Puma.

25th Nov 2024 2:17pm

Bluest

Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4216

Chicken Drumstick wrote:
Bluest wrote:
I'm going to be the killjoy fun-police here, but I'd just caution against running pressures on the road substantially different than what the manual says. The factory pressures will have been chosen for a reason. Comfort is only one factor. Tyre life, handling, wet grip etc are all part of the mix. An issue introduced by running a different pressure may not become apparent until you have to make an emergency manoeuvre and could result in the car rolling rather than sliding, or under/oversteering when it shouldn't, aquaplaning/skidding more easily, heat build-up leading to tyre failure and so on.

I'm not saying you'll definitely die in a ball of fire and a couple of PSI here or there probably won't make any difference, but tyre pressures do play in important role in vehicle safety.

Cobblers. If it was a 'real' issue, there would be legislation around it. And there isn't.

Sure a flat tyre is still a flat tyre. But there is a huge array of usable pressures depending on use, surface, driving style and the actual tyres you are running.

I don't want to get into to an argument, obviously, you can set your pressures to whatever you want. But, as the drivers/owners we aren't in possession of the full facts as to why a given pressure is specified and where the threshold is for things to become dangerous when you deviate from that.

By way of an extreme example. A long time ago now, but there was a serious issue with tyre failures leading to rollovers in American Ford Explorer SUVs. Firestone argued that had the specified tyre pressure been 4 psi higher the tyre failures would not have occured.

As I said, I'm not stating a couple of PSI will be life or death, but I read of people running 110s at 8-10psi under the factory rear tyre pressure for reasons of comfort which for me is pushing it too far. My question is why did LR set it at 46psi or whatever it is? It isn't for heavy load/towing as there is an even higher pressure specified for that.

Once off-road, and speeds are much slower and grip with the surface is lower, go to town on lowering pressures. 2007 110 TDCi Station Wagon XS

25th Nov 2024 5:45pm

revd

Member Since: 20 Apr 2024
Location: England
Posts: 127

I run my 110 HT rear at 10 psi below factory handbook pressure when unladen - I was given the ok by the LR suspension engineer who signed off the tyres on Td5/Puma Defenders after extensive testing at Michelin's test track. (he also adjusted my steering box and centred the steering rack, I paid in beer)

25th Nov 2024 8:56pm

Chicken Drumstick

Member Since: 17 Aug 2020
Location: Near MK
Posts: 751

TexasRover wrote:
Not 100% sure but are things like tire pressure monitoring not becoming a requirement together with all the other nanny (making money) schemes.

The Governments are pushing all this technology out for safety and environmental reasons and the manufacturers are loving it.

Don't be fooled. TPMS (Tyre Pressure Monitoring Systems) are NOT there for safety..... it is an EU lead stupidity on emissions. And is not present or mandatory in other World markets. The idea being if a tyre is flatter, it will increase drag and reduce mpg and increase emissions.

Some implementations are terrible, such as on my Jimny where less than 1 psi below the programmed level lights the dash up like a Christmas tree and will prevent the dash showing you anything useful until you put 0.8psi of pressure back into the tyre.

26th Nov 2024 9:35am

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