Tyre Pressures

Hah, Many car manuafacturers recommend pressures down around 26psi to improve ride comfort but most 4by's run about 35 to 40 psi on tar and 25 to 30 on gravel. Off road in sand you can go as low as 8-12psi to get the effect of a larger footprint on the ground to increase grip but generally 15 to 20psi good for off road.

ALWAYS depends on individual vehicle and what size tyres. If you are fully loaded then add 5 to 10 psi to these figures. 50 psi sounds high unless you have heavy load on. I run 40 generally.

There are many opinions on Tyre Pressures and you may get a few on this thread.

The lower the pressure the greater the contact patch with the road and the more the tyre can deform over rocks and objects. Trade off is that at low pressures you run risk of poor handing or rolling tyre off rim so easy does it on the right foot. At low pressures and higher speed the sidewalls of the tyre also heat up due to the friction of flexing and can blow out. Low Pressure = Lower Speeds.

Also remember there will be a difference of about 4psi between cold and hot tyres.

Cheers
Muddy

Short answer, No it will not cause any problems you should be concerned about, A little more tread wear possibly.

50psi sounds too high, it'd be like driving on the wheels off an old horse drawn cart, all steel and wood.
i drive a patrol ute and run 36psi all round on road cos i dont carry much, if loaded i might go higher. tried 40psi but found it too harsh unloaded.

Try 36/38psi on road.

Offroad all depends on "the conditions"..

Dirt road, firetrails, mud, wet, dry clay, etc.. anything down to 10psi should be fine offroad depending on the conditions.

I find a good rule of thumb (but this depends on the vehicle, load and tyre sizes) is:

42psi on Road.
29psi on Gravel.
16psi on Sand. (but anywhere down to 10psi when the going gets tough)

Try em', it won't hurt, and I reckon it'll work well for you. Personally I have run these same pressures on:

Daihatsu Feroza (approx 1.5 tonne with 205 15 tyres)
Daihatsu Rocky (approx 2.2 tonne with 9R tyres)
Toyota Surf (anywhere between 2.1 to 3 tonne plus loaded with 31" tyres).

Good luck with it! Just muck around with it.

Willem has the figures spot on, maybe even 30 in the blacktop if your travelling light. I run a Tirealert system which gives you pressure and temp readouts continually from each wheel, and may surprise a few the temp and pressure changes that go through over inflated tyres on asphalt, with 30psi in the backs and 28 in the front, I checked them on some HOT blacktop, tyres ranged from 28psi to 40 and 28deg to 65 after about 80k's, next morning I inflated them to 38psi, pressure rose to 55psi and temp nudged 75c. So some food for thought. Wragler MTR's which aren't really suited to full time use get over 60,000k's with 30psi pressure on blacktop.

Brian

Tyres tyres, just curious about your cruiser if its a diesel or a petrol, my brother and i have found in his 97 model 75 series diesel ute that the 32 x 11.5 put to much of a strain on the motor in sand, (The humble 1HZ never had that much go, rather it just keeps on goen) he changed over to 265 75R16 that according to BFG are 30mm smaller in width but the same overall diameter. I dont want to start a tyre debate AGAIN however you may find that a smaller tyre width will help overall with economy and noise and off road ability and etc etc. The idea of lettling your tyres down is to increase the track of the tyre NOT THE WIDTH. In other words your tyre should act like a set of excavator tracks. A tyre that alot of people don't know exists is a 235 75R16 BRG MT an absolute weapon in the mud and dirt. Just thought that 50psi is to much.