HUB RR S/A 3sp RSRK3 36 6B SL w/TRIM KIT/TWIST-SHIFTER TSC30 185/135mm ROTARYFeatures-3-Speed disc brake internally geared hub with a wide gear ratio of 177%-Rotary gear selector without protrusions outside the frame-6061 Aluminium hub shell-Compatible with 17 to 19 teeth sprocket-Anodized finishItem Specifications-Material:Aly-Color:Sil-Brake Type:6B-Use:RR-Hub Drilling:36H-Wt:1095g-CTF-R:19-Spacing / Axle:B/O 3/8-LTF-L:36-CTF-L:25-LTF-R:42-PCD-L:67-Gears:3s Int-PCD-R:67-OLD:122