Surly Single Cassette Cog 3/32" Splined 21t MFPN=5100-58432 }SRAM Eagle PG-1210/1230 Cassette Replacement

}SRAM Eagle PG-1210/1230 Cassette Replacement Cogs - 11-13-15 Cogs Lockring Included

Assists with removing stubborn female hex mounted pedal spindles

optional GoPro mount compatibility

PHR – Pro Head Reinforcement system increases the load-bearing surface of the nipples on the rim and reduces localized stresses

Surly Single Cassette Cog 3/32" Splined 21t MFPN=5100-58432 }SRAM Eagle PG-1210/1230 Cassette ReplacementSurly 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