Surly Track Cog 1/8'' X 16t Silver MFPN=180-002-003 Fit 7mm standard rails and

Fit 7mm standard rails and 7x9mm oval rails

Its compact design was specially developed to relief the sensitive perineal area

} Confident and capable of cleaning the A-line

9mm Spoke Type Stainless Rim Material Aluminum Axle Type 12mm TA Rim Color Black Valve Presta Wheel Diameter/ISO 29 / 622 Wheel-Brake Comp

Surly Track Cog 1/8'' X 16t Silver MFPN=180-002-003 Fit 7mm standard rails andSurly 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''