Surly Single Cassette Cog 3/32" Splined 21t MFPN=00.2518.025.011 Forged and CNC weight-optimized alloy

Forged and CNC weight-optimized alloy pedal body is shot peened and anodized for increased durability

BB Inclusion No Crankset Material Aluminum Pedals Thread 9/16 Drivetrain Spacing Road Disc BCD Direct Mount Teeth 42 Primary Color Black Crank Spindle Diameter 28

70 Tire Diameter/ISO 28/622 Tubeless Technology TLR e-Bike approved No

17oz Steerer Tube Material Steel Steer Tube Diameter 1-1/8" Top Cap 24x1

Surly Single Cassette Cog 3/32" Splined 21t MFPN=00.2518.025.011 Forged and CNC weight-optimized alloySurly 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 Tooth Count 21 Cassette Body Type Shimano HG 7 Speed Drivetrain Speeds Single Speed 3 32" Material Steel