The Shimano Alfine SL-S503 is an 8-speed Rapidfire Plus shifter designed for seamless integration with Shimano's Alfine internal geared hubs. Engineered for urban commuting and trekking, it offers precise and reliable shifting performance. 2-Way Release: Allows shifting to a lower gear by either pulling the index finger or pushing the thumb, providing flexibility in shifting style. Optical Gear Display: Displays the current gear position, enabling riders to easily monitor their gear selection. Ergonomic Design: The shifter's design ensures comfortable and intuitive operation, enhancing the overall riding experience. Model Number: SL-S503 Color: Silver Speeds: 8 Shifter Type: Rapidfire Plus Compatible Hubs: Shimano Alfine SG-S501, Nexus Inter-8 Cable Lengths: 2280mm inner cable, 2100mm black outer casing Clamp Diameter: 22.2mm Material: Main lever body made of steel and resin; base cover made of resin Included Components: Shifter unit, inner cable, outer casing, resin cap, inner fixing bolt unit Compatibility: Designed for use with CJ-8S20 cassette joint