5-Speed internal gear hub with gear ratio of 243% Rotary gear selector without protrusions outside the frame Designed for heavy duty use A356 Aluminium hub shell Compatible with 16 to 22 teeth sprocket 25% gear steps RR 5sp Int 36H B/O 3/8 Alloy Sil 2290g DRUM 135mmUPC/EAN/GTIN: 4710944248104