Surly Singleator Chain Tensioner Description: The Surly Singleator Chain Tensioner offers a reliable, adjustable solution for tensioning chains on singlespeed drivetrains with vertical dropouts. Designed to mount directly to a standard derailleur hanger, the Singleator features a triple-sealed spring, a floating 11-tooth pulley, and a fully adjustable chain line. Its forged body and stainless-steel pivot bushing ensure long-term durability, while chain guides and a wide cog capacity support consistent, quiet operation. Compatible with both 1/8" and 3/32" chains. Note: Do not use with a coaster brake, fixed gear, multi-cog, or multi-ring drivetrains Features: Triple-sealed spring, large cog capacity, and chain guides Stainless steel pivot bushing Forged body Includes two springs for upward or downward tension adjustment. Push down spring installed, push up spring in packaging. Specifications: Color: Black