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Happy 2024! This year marks our 10th year of conjuring up cycling magic in the Laurel District. Our February 2024 hours are: M-F 11-6, SAT 10-5. Wait time for most repairs is 1-3 days. Questions? E-mail us at or text/call us at 510-328-1158.

BOX One Single Speed Chromoly Cogs

BOX One Single Speed Chromoly Cogs
  • Size: 13T
  • Size: 14T
  • Size: 15T
  • Size: 16T
  • Size: 17T
  • Size: 18T
Please select options


Box One Single-Speed Chromoly Cogs are CNC-machined from long-wearing CNC-machined 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 a More Solid Interface with Freehub Body

Part Numbers

Option UPC MPN
Black / 13T 639266092421 BX-CO150CM13-BK
Black / 14T 639266092438 BX-CO150CM14-BK
Black / 15T 639266092445 BX-CO150CM15-BK
Black / 16T 639266092452 BX-CO150CM16-BK
Black / 17T 639266092469 BX-CO150CM17-BK
Black / 18T 639266092476 BX-CO150CM18-BK