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Surly

Single Cassette Cog 3/32" Splined
$30.00
Surly's cassette-type cogs are designed to fit on standard Shimano compatible freehub bodies.
Surly Track Cog 3/32'' X 17t Silver
$30.00
Surly 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.
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