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90 Dreamer

Member Since: 13 Jul 2019
Location: Oop North
Posts: 2171

2016 Defender 90 Puma 2.2 HT Corris Grey

16" tyre pressure variations

Just looking for some ideas about ideal pressures in various situations - have seen as little as 30psi and towards 50psi depending on road use and towing, etc........

Not done loads of miles but have tried early 30's all round and then inflated rears to 48psi to tow, ending up using this pressure for a shot commute until i could alter them and noticed it was far more rigid and very keen to activate the traction light in this state........

If you did a little light green laning would you drop them further??

If it matters its a late model Puma 2.2 H/T 90

14th Sep 2019 9:33pm

Grouse

Member Since: 16 Apr 2012
Location: on the hill
Posts: 521

28 front and 35 rear - 110 with HD suspension and average load - if fully laden 48 rear

28 Front and 48 rear is std for MOD 110

14th Sep 2019 10:40pm

Naks

Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2646

2010 Defender 90 Puma 2.4 SW Alpine White

One of my long-time overlanding friends showed me the correct way determine your tyre pressures:

Every tyre has a max load, max pressure, and max speed rating.

Load your car and weigh it on each axle.

Then work out the pressure from there.

You can then adjust as you need for different loads, etc.

For gravel travel, drop by half, or 1,8 bar.

For off-roading, drop to 1.4-1.6 bar.

For sand, drop to 1.0 bar, 0.8 bar if very soft sand. --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged

Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

15th Sep 2019 6:18am

Co1

Member Since: 19 Aug 2018
Location: North Yorkshire
Posts: 3685

I have a 90 HT puma, and unladen I go with 30psi all round. Seems comfortable enough to me and no traction issues.

15th Sep 2019 6:31am

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5741

2006 Defender 110 Td5 USW Zermatt Silver

32 all corners. If serious mud then drop to 12

15th Sep 2019 7:13am

90 Dreamer

Member Since: 13 Jul 2019
Location: Oop North
Posts: 2171

And if towing around 48psi for the rear with fronts more 30's is fine??

15th Sep 2019 9:00am

HardCharger

Member Since: 03 Mar 2013
Location: Manila
Posts: 740

2011 Defender 110 Puma 2.4 SW Stornoway Grey

I just follow the manual and the label on the door jamb, 30 psi front, 48 psi rear. I add 2 to 4 psi if I've been running for a while when checking the pressures.

One of my friends suggested that I lower the pressures a bit as the ride was, according to him, a bit on the bouncy side. This is when I ran the Cooper STMaxx that I got as new old stock so the rubber might have hardened already. When I recently switched to newly manufactured Pirelli Scorpion MTs, even with the 30 - 48 pressures, the ride is very civil.

There are proponents to the 4 psi rule which involves a lot of measuring to determine pressures as they will work for you and your set up. But once you find out the appropriate pressures for you, it'll be pretty spot on to ensure longer wear intervals for your tires, a good ride, and optimal traction provided. Once I get better kit, I'll probably do this again as it did wonders for my H*L*x back in the day.

16th Sep 2019 2:30am

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