> Another contributor to this list suggested that dropping tyre pressure=20
> really didn't make much difference to the traction, and I have always=20
> been concerned that the tube would rotate inside the tyre, or that the=20
> tyre bead would slip off the wheel rim.
Dropping the tyre pressure gives you much more traction on soft
surfaces, but you must really drop the pressure, until the tyre
looks like a flat tyre.
This enlarges the surface of the tyre on the ground and helps that=20
the rotating tyre doesn't dig a hole in the soft ground.=20
You also have to take care that the tire with (nearly) no air pressure
doesn't rotate on the rim. Sometimes special metal bars inside the=20
tire were used to fit the tire on the rim.=20
Trial motorbikes also use very low tire pressures on soft ground.
They use "Reifenhalter" (tire holder?) to keep the tire on the rim,
even with only 5 psi air pressure.
Regards
Andreas
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