Stamped cogs are inexpensive, but tend to take a bite out of your freehub. Wide profile cogs are great but tend to take a bite out of your wallet. The Problem Solver Singlespeed Cog & Carrier is Shimano splined and sandwiches a spline-less cog. This gives riders a wide profile that won't damage your freehub and cogs that are less expensive to replace. The cogs themselves have a 6-bolt hole pattern just like disc rotors so you can attach them to hubs with disc rotor mounts for fixed-gear use.
Wide-profile alloy cog carrier so it won't damage your freehub body
6-bolt compatible chromoly cog allows the cog to be mounted on a disc brake hub for fixed-gear use
CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including (Cadmium, Phthalates, Bisphenol, Nickel (Metallic), di(2-ethylhexyl)phthalate "DEHP"), which is known to the State of California to cause cancer and/or cause birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Wide base is nice if you have aluminum free hub. I believe it's wider & lighter than a surly on my other single speed. Aluminum carrier saves some weight. Plus it can be used as a fixed gear if wanted, as long as it's on a 6 bolt hub.
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ALL-CITY TRACK COGGearing can be tough to nail
down, especially if you're using a single speed bike.Standard 1.37" x 24 TPI (English) threadMachined chromoly steel16T and lower have a solid design, 17T and higher feature weight-reducing cutouts | All-City Track ...
The All City track cog is precision machined
from CroMoly steel. The All City cog has incredible quality at an affordable price. 1/8” width cogs Threads are 1.37” x 24 tpi 16T and lower are solid, while 17t and higher ...
Use the Gates Carbon Drive CDX CenterTrack Belt
Drive Cogs to change your gear ration on your belt-driven bike. These cogs are offered either in a 9-spline version, Nexus/Alfine, or fixed version. Check the pull down menu to choose the ...