Has a 1 5/16" center hole with an internal 30-tooth "star" spline to interface with the axle. It is held in place by a castellated nut (3/4" x 16tpi) and a thick (.118") flat washer. All Electric models and the earlier 2-cycle gas hub/drums have a smaller hole and are not interchangeable with this hub/drum
800 & 900 Series, ST350, ST480 & ST 4x4. (excludes hydraulic brakes)
Fits OEM# 21807G1M.