Problem Solvers' Cassette Cog Carrier (CCC) bolts on to a splineless single-speed cog to give you a wide, Shimano-splined cog to run on your freehub body. The wide profile won't damage your freehub body.
Aluminum carrier with steel cogs
|Cassette Cog Carrier w/ 17-tooth cog||708752092846||FW9907||COPRSO1S|
|Cassette Cog Carrier w/ 19-tooth cog||708752092853||FW9908|