<span class="highlight">Tyre</span> <span class="highlight">pressures</span> Roadgrippers

I have used grippers on my hilux and I noted that toyota specs seemed a bit low so I ran them mostly around 30psi and they still wore mainly on the centre. I am nowrunning a bit lower on a pair to even it up as they get close to retirement. Meanwhile the kuhmos run thirty but wore on the outside so I have them on 45psi to wear the centres down.

Point is I think it all depends on the tyre manufacturer rather than the vehicle maker. That and the type of use they get. I would ask the local retailer what they recommend because they get to what happens to them.

Thats my experience anyway.

Owen

Geoff
Would I be correct in that from memory the F is a 7.50 x 16 and the S is a 235 x 16?
If so I ran both on a troopy over a 10 year span, the 7.50's come in either a 6 ply or 8 ply and the 235's are roughly equivalent to a 6 ply.
On the troopy laden I ran up to 55 psi rear and always around 40 front with the 7.50's and achieved even wear.
The 235's are a lighter tyre and are normally fitted to the base model 100 series. I ran them at a lower pressure as they have a lower load rating and are also have a lighter more flexible wall. Pressures I ran with the 235's were around 40 on the front and 45 on the rear but dropped them further (and dropped the speed further) on rocky roads than the 7.50's due to the lighter construction.
The 235's were an excellent highway and sand tyre but being softer in the walls I was always carefull in rocky country

Tyre pressures! Its easy you use the 4 PSI rule. I drive a GUIV Patrol and normally run 35PSI, towing a heavy trailer I go up to 45 in the back and 40 in the front. Using the 4 psi rule. Check tyre pressures first thing in the morning when tyres are cold ( no good driving down the service station then checking them they warm up pretty quick and use your own gauge to be consistent) Then after driving about 50k or more stop and immediately check the pressures. It should have risen by 4 PSI. If not your tyres are over inflated, If they have risen by more than 4psi they are under inflated.