I've found that when wheeling with my 35's if I don't drop the tyres pressures down to 10psi I'm wasting my time, the tyres just don't get traction whether in rocks or greasy clay, even at 12psi traction is compromised, on my 37's they go down to 8psi to make them work
Another great benefit of airing down is the ride comfort, the lower the pressure the smoother the ride
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