Surly Single Cassette Cog 3/32" Splined 15t ERD-600mm light and stiff to effortlessly

light and stiff to effortlessly propel you forward

ENVELOPMENT - SensiFit™ Race: This innovative SensiFit™ technology is strategically positioned on the shell to perfectly hold the liner and your foot in place

Downtube attachment points can move to make sure every one of your bikes has the space it needs including full power e-bikes Model Mission Mid-Size Pickup # Bikes 5 Color Black Configuration Mid

A racing favorite

Surly Single Cassette Cog 3/32" Splined 15t ERD-600mm light and stiff to effortlesslySurly 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 15 Cassette Body Type Shimano HG 7 Speed Drivetrain Speeds Single Speed 3 32" Material Steel