[tim-tim]

Does anyone know what the Coefficient of Friction for the HiGrip Wheel is normal to the direction of travel? I know AnyMark has 0.95-1 listed as the coefficient of friction for the wheels; however, I don't know if that is for the direction of travel exclusively or both.

Or is there an effective coefficient of friction due to the "biting" in the carpet normal to the direction of travel? Essentially in an equation what do I use for Mu_x (direction of travel) and Mu_y (normal to direction of travel)?

**A bit off topic from what the OP has started**