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Surly Stainless Steel Track Lockring. - Fits all but Campagnolo, Miche or Phil Wood - 5mm thick with 0.65mm lip for maximum thread and lockring wrench contact

Surly 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

Pair this kit with a cassette cog of your choosing (sold separately) and discover the joy and simplicity of a singlespeed without the cost of a new wheel. The Singlespeed Spacer Kit includes a variety of high quality aluminum spacers so you can dial your chainline and a stainless steel lockring to tighten everything down right.