Surly Track Cog 1/8'' X 15t Silver Model=Storm HC 75 Thread Length (mm) 20

75 Thread Length (mm) 20 Axle Diameter (mm) 12 Overall Length (mm) 167 Weight 76

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Double or Triple Double Double or Triple Triple Front Der/Shifter Compatibility SRAM Mountain Rear Der/Shifter Compatibility Shimano Mountain Shifter Style Twist Drivetrain Speeds 8 Weight 120

Surly Track Cog 1/8'' X 15t Silver Model=Storm HC 75 Thread Length (mm) 20Surly Track Cog 1 8'' X 15t Silver. Surly 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 TECH SPECS Tooth Count 15