Shimano CS-S500 Alfine 20T Single Sprocket Silver/Black

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Enhanced Chain Retention For use on Shimano's internal gear Alfine hubs, the S500 cogs feature a special profile for enhanced chain retention. Shimano’s sprocket features a chrome plated steel construction, and a revised tooth profile to stop chain skipping.
• MODEL NO: CS-S500 • SERIES: ALFINE S7000/S700 Series • Chain guard (With) • Chain guard (Without) • Gear teeth 20T X (w/ and w/o guard) • Gear Thickness: 2mm • Recommended chain Super Narrow HG for 9-speed: Yes