Quote: Originally posted by 4x4abc | Quote: Originally posted by David K | so don't be surprised if you find that you need to drop the pressure to 10 psi in front and 8 psi in the back tires... |
as long as all tires carry about the same load - tire pressure should be equal on a 4. Higher pressure in the front will only create unwanted
resistance. Resistance translates to stuck.
Only on very steep grades (when the center of gravity changes to the back) you may want 5 psi in the front and 10 psi in the rear. To be immediately
corrected when level.
And by the way, tires for off-road should have the smallest wheel possible (15" better than 16") and the tires should be as large as possible. If the
gearing would suffer too much (Subaru) get the widest tire possible (225 better than 215).
Why? More volume of air in the tires. More flexibility for airing down. |
When beach running, more weight (from engine, etc.) is over the front tires, so, for the rears to have as much contact area as the deflated front
tires, more air is removed from them to correct for the lighter back tire load. If your truck or SUV is heavily packed then that would balance the
weight over all four tires better. Anyway, that has always worked well for me and never any issues with the transfer case. Normally, all four are
deflated equally to 20, 15, or 10 psi depending on the need. Only if 10 psi doesn't work would I take more out of the backs (as they don't steer so
less chance of popping the bead). |