5-Speed internal gear hub with gear ratio of 243% Gear steps of 25%, 25%, 25% and 25% Rotary gear selector without protrusions outside the frame Designed for heavy duty use A356 Aluminium hub shell Compatible with 16 to 22 teeth sprocket RR 5sp Int 36H B/O 3/8 Alloy Sil 2480g DRUM 135mmUPC/EAN/GTIN: 4710944250046