SURLY Singleator Chain Tensioner - Black closeout The FRW-1 is a one-inch

The FRW-1 is a one-inch socket and securely holds freewheel/lockring tools for removal and installation

Photo for color and material reference only

adjustable attachment below your bike seat

racing gravel

SURLY Singleator Chain Tensioner - Black closeout The FRW-1 is a one-inchSurly 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