Surly Track Cog 1/8'' X 19t Silver MFPN=8030819354430 Body mapped mesh for optimal

Body mapped mesh for optimal temperature regulation

Stroke (mm) 55 Lockout Switch Shock Mounted Switch Metric Yes Eyelet Diameter (mm) Trunnion

AB0030: 12t pulley set with 4mm upper & 5mm lower bolt-holes is designed as direct fit upgrade for SRAM 12 speed road and gravel derailleurs

}WTB Trail Boss Tire - 29 x 2

Surly Track Cog 1/8'' X 19t Silver MFPN=8030819354430 Body mapped mesh for optimalSurly track cogs are threaded the same as a BMX freewheel (1. 375 x 24 tpi right hand threads). This means that they will fit on single speed rear hubs as well as BMX freewheel hubs but this application is not recommended. Track cogs are meant to work on track hubs only. 415 hardened chromoly steel 1. 375" x 24 tpi Photo for color and material reference only Tooth Count 19 Size 1 8''