Surly Track Cog 1/8'' X 18t Silver CheckoutTitle=Schwalbe Green Marathon Tire - 20 x 1.50 14 mm diameter hardened steel

14 mm diameter hardened steel shackle

Rear tire with 3D multi-angle knobs designed for cornering traction

Beta and Ultra Mixes in an easy-to-apply liquid form that has the bonus of improving speed over their iron-in cousins

allowing the shell to be flexible and work with your body

Surly Track Cog 1/8'' X 18t Silver CheckoutTitle=Schwalbe Green Marathon Tire - 20 x 1.50 14 mm diameter hardened steelSurly 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 18 Size 1 8''