Box One Single-Speed Chromoly Cogs are CNC-machined from long-wearing CNC-machined from chrome-molybdenum. It's designed to fit Shimano™ compatible cassette hubs and has a 5mm wide inner base, giving a more solid interface with the cassette body.
Chromoly Steel Offers Extra Long Service Life
5mm Wide Inner Base to Give More Solid Interface with Freehub Body
Chain: 3/32” or ⅛”