Surly Track Cog 1/8'' X 19t Silver MFPN=401225123 Color Black Defined Color Black

Color Black Defined Color Black ISO Diameter 622 / Road / 29" ISO Width (mm) 65 Labeled Size 29 x 2

Bearing Grade Stainless Steel Crown Race Diameter 40mm Primary Color Green SHIS Upper IS42/28

Automatic locking function

Includes foam organizer

Surly Track Cog 1/8'' X 19t Silver MFPN=401225123 Color Black Defined Color BlackSurly 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''