Tyre Pressures on and off road

It depends on tire conditions/suspension/weight/track conditions/weather etc etc etc.

Its all trial and error.

Try 25-29psi offroad, and 35-40psi on road.

Hey dude,

From my experience, I usually go as low as 15-18PSI. (BUT) if I have my truck FULLY LOADED (bout 3T) then I go about 23-25PSI.

Follow the vehicle manufacturers recommendations is the best advice for any tyre except extreme treads. I have just got home after three months travelling and about 5000 kms of dirt road, including going up to the top of Cape York up the OTR. I had new Cooper ST's fitted before we left and they had been inflated to 30 psi all around by the fitters. This pressure gave me a very harsh ride so I put it back to the recommended 26 psi all around and it was much better. Fully loaded the rear tyres seemed to bulge a bit (looked a bit flat) so I put them up to 28 psi on the road. On the road up to the Cape though I soon dropped them to 26 psi. The tyres seem to have worn evenly and did not have any chunks knocked out of them.
Regards
Richard

Hi Peter,

As all tyres run on different tyre pressures dependant on size and load, The general rule for off road is half the normal road pressure you are running on. Once off road you can adjust the pressures further if needed.

Hope this is of some help.

Dellycat

Peter
I run the same size tyre on a Cruiser (although it's the STT pattern). Unloaded on road I run about 32 PSI all round and generally drop down to about 24PSI off road. Loaded (campoing gear + family) on road about 38 PSI and off road about 30 PSI. However depends on how much load, travel speed, weather, road surface etc. The best thing to do is to use the 4PSI rule of thumb for on road pressure. Start with say 32 and run until tyre is at operating temperature. Take pressure again. If it has increased by 4 the starting pressure was OK. If it has increased by more then the starting pressure was too low, and if it has increased by less than 4 you had too much to start with. It's a bit fiddly but seems to work OK. Not suitable for off road though.

What with all the fuss about 4 x 4's in the cities................ I reckon run em' soft enough so you don't damage pedestrians when ya run em' over every day like they reckon we all do..............