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 Solvers Casettte Cog Carrier (CCC) is Shimano-splined, and sandwiches a spline-less cog. This gives you a wide profile that won't damage your freehub, and inexpensive replacement cogs. But wait, are you sitting down? 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
6-bolt compatible chromoly cog
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5.0 GEARS 1 review
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This is my first time using the Problem Solvers cog for a 1x MTB. I have used stamped-type cogs before without any problem and this one works great and has a very nice finished look to it. I have not tried and don't intend to use this as a fixie cog (using the 6-bolt disc mount) but the aluminum carriers fit my Shimano freehub well, run true, and feel very secure. The carrier system won't save you any time if you intend to swap out cogs, but it is light, works great, won't deform the splines on an Al or Ti freehub, and looks great. Thanks Tree Fort for selling the size I need (19T)!