Noise wheel shimmy is nothing to take lightly. I was told by several L4 folks not to put over 30 psi in the noise tire. The fact that it looks low is what makes a larger foot print and keeps it from shimmying. Since there is no noise wheel steering mechanism to add mass or help restrain the start of a shimmy we need the tire to be much closer to the correct pressure determined by the test pilots and folks that went before us. Actually, I think the noise strut is done very good to have it's internal shimmy dampener and still have full castering ability.

The mains are more up to the type of tire. I use 60 psi on Flight Custom III.