Classic 3-speed internal gear hub with gear ratio of 177% Gear steps of 33% 6061 Aluminium hub shell Compatible with 13 to 24 teeth sprocket Anodized finish Includes trim kit and SLS30 thumb shifter RR 3s Int 36H B/O 3/8 Alloy Sil 1080g 6B 135mmUPC/EAN/GTIN: 4710944238761