Padded on all sides for frame finish protection

Maximum seating comfort

an OPTICAL GEAR DISPLAY in a durable assembly

Installed using standard 16-notch bottom bracket tool

SURLY Singleator Chain Tensioner - Black Compatio_Enriched Padded on all sides forSurly Singleator mounts right up to your derailleur hanger and provides a simple, effective, and adjustable means of tensioning the excess chain slack found in vertical dropout single speed drivetrains. Triple sealed spring, large cog capacity and chain guides Stainless steel pivot bushing Includes two springs for upward or downward tension adjustment Do not use with a coaster brake, fixed gear, multi cog or multi ring drivetrains Source: Quality