This built-up rear wheel features a single-wall chrome-plated steel rim and a chrome-plated steel hub with a coaster brake system. It is laced with 36 spokes, features a 3/8" nutted axle, and includes an 18T sprocket for the coaster brake hub as well as the required fittings. This is a 20" wheel to suit tyres with a 406mm Bead Seat Diameter.