Box One Chromoly Single Speed Race Cog supplier_20039623409775 ERD: 391-512

ERD: 391-512

Replacement bearing to fit the Drive side of the West coaster hub

Weight: 1000g (35

The arms are made from heat-treated 4130 Chromoly with a rectangle cross section for extra stiffness and a beefy pedal boss for increased strength with an angled back for frame clearance

Made from extruded 6061 aluminium

Box One Chromoly Single Speed Race Cog supplier_20039623409775 ERD: 391-512Box One Single Speed Cogs are CNC machined from chrome molybdenum and are designed to fit Shimano compatible cassette hubs and have a 5mm wide inner base, giving a more solid connection to the cassette body. The chromoly cogs have an ED finish with laser etched logos.