Surly Track Cog 1/8'' X 15t Silver CheckoutSpec= Trunnion 42.5 - Vivid C1+ (2024+) Surface treatment increases durability and

Surface treatment increases durability and smoothness

Used as a base liner for gloves during the winter season to increase warmth

Slight scratches from pedals

A percentage of the proceeds from the sales of the new North Shore grips are used to support the NSMBA and trail building on the North Shore

Surly Track Cog 1/8'' X 15t Silver CheckoutSpec= Trunnion 42.5 - Vivid C1+ (2024+) Surface treatment increases durability 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 15 Size 1 8''