Surly Single Cassette Cog 3/32" Splined 13t MFPN=910-21-372 all electrically cured to minimize

all electrically cured to minimize rolling resistance

} Works with all multi-speed bikes (including 12-speed) as well as some single-speed models and e-bikes

laminated beech and oak wood veneer and real Italian suede leather

Ring Position/Type InnerRing Position/Type OuterTooth Count 46/33Drivetrain Speeds 12Round or Oval RoundChainring BCD SRAM Thread MountMaterial AluminumColor BlackDefined Color Black

EVOL air spring with enlarged negative air spring to assist with mid-stroke support

Surly Single Cassette Cog 3/32" Splined 13t MFPN=910-21-372 all electrically cured to minimizeSurly 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 13 Cassette Body Type Shimano HG 7 Speed Drivetrain Speeds Single Speed 3 32" Material Steel