Tyre Pressures

[Allan]

I've got B.F.G 255/85-16 KM2's fitted to my Puma 110 and am curious as to what tyre pressures may be recommended both lightly loaded and fully laden. At the moment I am running 30psi front 40psi rear with only light load and fully loaded I crank the rears up to 48psi. But a friend of mine thinks that’s too low for that size tyre. Opinions would be appreciated.


Allan

[numpty]

My Defender runs standard 235/85/16's and I run 35 all round for everyday running and up the rears to around 42/45 when loaded and leave the fronts as are.

I dont do excessive highway speeds and these pressures work for me.

[Summiitt]

I run Mickey t, mtz 265/75/16 on my 130 tray top, it's up around 3.2-3.5 ton all the time and I run 55 in the rear and 45 in the front, so I think 48 is fine in a 110. In my old puma 110 with standard size 235 s on I ran 35 round town and 45 loaded for a trip, never had an issue.

[TimNZ]

Hi Allan,

I'm still on standard tyres, but I'm running the placarded (sp?) pressures, 30psi front, 48psi rear. I find the front rides too harsh if I increase the pressure in the front, and the back wallows if I have them any lower.

On rough corrugated roads I drop the fronts to 25 and the rears to 28, but I keep my speed down accordingly. Any lower than this the ride deteriorates.

Hope this helps,

Tim

[Catmatt]

I've got B.F.G 255/85-16 KM2's fitted to my Puma 110 and am curious as to what tyre pressures may be recommended both lightly loaded and fully laden. At the moment I am running 30psi front 40psi rear with only light load and fully loaded I crank the rears up to 48psi. But a friend of mine thinks that’s too low for that size tyre. Opinions would be appreciated.


Allan


38 front and 40 PSI rear in my 265/75 X16's BFG's fitted to my Disco2 fully loaded plus towing trailer or empty on the bitumen. Have a good wear pattern all over the tread, no scolloping and have about 45% tread after 50+K's.

I drop them to 18-20 off road and have had no issues whatsoever. I'm completely sold on the BFG muddies!!

1 tip - I rotate them regularly...particularly here in Canberra (The land of a million round-a-bouts) ;)

[newhue]

255/85/16 BFG Km2

light load
Front 36, rear 40

heavy load-expedition
Front 36, rear 44

[Naks]

Horses for course ;)

I use the following rule:

1. Take the axle weight / 2 (two wheels) and divide by wheel carrying capacity (in my case 1550kg) and multiply by the tyre pressure at max load (BFG AT = 5.5)

Total vehicle weight: 2500kg
Front axle: 1150 (46%)
Rear axle: 1350 (54%)

Pressures
Front: (1150/2)*(5.5/1550) = 2.04 (round off to 2.1)
Rear: (1350/2)*(5.5/1550) = 2.40 (round off to 2.5)

3. When you get to gravel, measure actual tyre pressure (call it AP), deflate to half.
4. When you get back to tar, re-inflate to AP
5. For offroading on rocky trails, drop to 1.2-1.5 bar all round
6. For offroading on sand, drop to 1.0-0.8 bar all round

[chook73]

A lot of people swear by the 4psi rule, I can't remember where or how I found it. I have tried it a few times and it gives you a good guide to pressures

4psi Rule (http://www.aawen4x4.com.au/index.php?option=com_content&view=article&id=1:4psi-rule&catid=2:current&Itemid=7)

[dcale]

I've got B.F.G 255/85-16 KM2's fitted to my Puma 110 and am curious as to what tyre pressures may be recommended both lightly loaded and fully laden. At the moment I am running 30psi front 40psi rear with only light load and fully loaded I crank the rears up to 48psi. But a friend of mine thinks that’s too low for that size tyre. Opinions would be appreciated.


Allan


Don't mean to hijack the thread, but what did they cost you?
Thanks
Darren

[Allan]

Don't mean to hijack the thread, but what did they cost you?
Thanks
Darren

Will have to look it up, will get back to you. thanks all for the posts all.
Addit:- just under $2000.00 fitted for five.

Allan

[newhue]

A lot of people swear by the 4psi rule, I can't remember where or how I found it. I have tried it a few times and it gives you a good guide to pressures

4psi Rule (http://www.aawen4x4.com.au/index.php?option=com_content&view=article&id=1:4psi-rule&catid=2:current&Itemid=7)

me, it works a treat