3-Speed 70mm drum brake internal gear hub with an overall gear ratio of 177% Gear steps of 33% Rotary gear selector without protrusions outside the frame A356 Aluminium hub shell Compatible with 17 to 19 teeth sprocket Natural alloy finish Includes trim kit with 18T sprocket and TSC34 twist shifter Axle length 185mm RR 3s Int 36H B/O 3/8 Sil 1440g DRUM 135mmUPC/EAN/GTIN: 4710944257540