Designed for ultralight aircraft with weight less than 900 lbs. Work-hardened 2-pc rims have a specially designed shoulder and thicker outer flange for better seal and support of tire. Wheel width of 5-3/8″ accepts any 6″ tire/tube combination. Precision 5/8″ sealed ball bearings. Wheel is mated to a 4″ single piston brake assembly developing 93,441 ft lbs of kinetic energy. Includes 5/8″ non-weldable axle w/hardware. Total kit wt : 3.7 lbs. Silver. Kit consists of 1 each wheel, brake and axle assembly.