Surly Single Cassette Cog 3/32" Splined 17t Model=Singleator Scrap Tool 15mm open end wrench for

15mm open end wrench for pedals

Clearance for knobby cyclocross tires and full fenders

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Surly Single Cassette Cog 3/32" Splined 17t Model=Singleator Scrap Tool 15mm open end wrench forSurly Single Cassette Cog 3 32" Splined 17t. Surly Single Speed Cogs. Designed as a singlespeed cog but may also be stacked and used with 9 speed shifter. Multi gear use will result in slower less crisp shifting than cogs designed for multi gear systems Fit Shimano freehub splines SCM 415 hardened chromoly steel Photo for color and material reference only TECH SPECS Tooth Count 17 Cassette Body Type Shimano 7 Speed Material Steel Drivetrain Speeds