Shimano Alfine Single Sprocket S500

. Alloy sprocket carrier with revised tooth profile to prevent chain skip Features Number of Sprockets Single sprocket for FH MX70 Sprocket Material Steel Sprocket Finish Chrome plated Chain Compatibility Super Narrow HG 20T Includes chain guideA 2 year warranty is offered with all Shimano products from Chain Reaction Cycles 3 years on Dura Ace and XTR products BuyShimano Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.