Long search ended at Jensenusa where the great folks in customer service always seem to have an eloquent s s solution for my shop needs. The Provkem Solvers Single Speed Cog was just such a solution and it saved me from finding some metal and drilling a bunch of holes. It is now an Uber Cool display piece that gets lots on compliments for its multi use artistic solution.
Most economically viable way to have cog options with SS
Using these cogs with the Problem Solvers or Origin8 (as pictured) adapters is the best option I have found for swapping out gear ratios for SS. The adapter gives the cog a larger footprint on the driver so you don't end up with a cog that digs into the soft aluminum drivers that lighter hubs love to use.
I also use one of these bolted to a disk brake face on a fixed gear bike. Both have served me well for miles and miles of pain and smiles.
This cog with it's adapter is a fantastic way to do an SS conversion without chewing up your driver.
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