SURLY Singleator Chain Tensioner - Black Compatio_Enriched Shimano SF-MX30 Freewheels

Shimano SF-MX30 Freewheels

Compatible with both road and mountain bike brakes

3M Scotchlite reflectors

The designs and materials have passed extensive life and ultimate strength tests

Direct mount ring replaces the existing chainring and spider on 3-bolt GXP cranks

SURLY Singleator Chain Tensioner - Black Compatio_Enriched Shimano SF-MX30 FreewheelsSurly 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