Designed for ultralight aircraft with weights less than 900 lbs. Work hardened 2 piece rim has 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. Axle is 5/8″ non weldable. Total kit weight is 3.7 lbs. Gold. Kit consists of 1 each wheel, brake and axle assembly.