Surly Track Cog 1/8'' X 16t Silver MFPN=WHHARL27RK Quill Insertion Diameter: 25

Quill Insertion Diameter: 25

The larger 14-tooth X-SYNC lower pulley easily facilitates 11- to 50- and 10- to 50-tooth cassette capacity and also adds to NX Eagles overall smooth-pedaling feel

} REAR SHOCK EYELET ASSEMBLY - (EYELET

5mm internal width

Surly Track Cog 1/8'' X 16t Silver MFPN=WHHARL27RK Quill Insertion Diameter: 25Surly 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 16 Size 1 8''