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A cog attaches to the hub on the rear wheel and works to provide change gear ratios to the rider. Cogs come in two varieties, freewheels or cassettes, of which cassettes are a newer development.
Shimano All the Most Popular BMX Aluminum Race Cogs at Dan's Comp
Showing 1 to 2 of 2 Products
Shimano Compatible Cassette Cog (Steel) (3/32) (Silver) (18T)
Shimano Compatible Cassette Cog (Steel) (3/32) (Silver) (16T)