NEW Surly Cogs Track Cog Surly Track Cog 3/32'' X 15t Silver fork-type_suspension The Shimano RD-M6100 Rear Derailleur

The Shimano RD-M6100 Rear Derailleur provides efficient and smooth shifting for Deore M6100 12-speed drivetrains

Machined 7000 series extruded bar stock

Saris Trainer Thru-Axles allow tru-axle equipped bikes to be used on Saris trainers

Outboard clamp is replaced by extra rubber for cushioning

Brakes: TRP Spyre-C

NEW Surly Cogs Track Cog Surly Track Cog 3/32'' X 15t Silver fork-type_suspension The Shimano RD-M6100 Rear DerailleurSurly track cogs are threaded the same as a BMX freewheel (1. 375 x 24 tpi right hand threads). This means that they will fit on single speed rear hubs, as well as BMX freewheel hubs, but this application is not recommended. Track cogs are meant to work on track hubs only. 415 hardened chromoly steel 1. 375" x 24 tpi Photo for color and material reference only Tooth Count: 15