Box One Single-Speed Cogs are available now in two different versions — CNC-machined from long-wearing 7075-T6 aluminum alloy or CNC-machined from chrome-molybdenum. Both types are designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body. The alloy cogs are anodized black with laser-etched graphics, while the Chromoly cogs have an ED finish with laser-etched logos.

Weight:

• 13t: 8 grams / 0.3 ounces
• 14t: 11 grams / 0.4 ounces
• 15t: 13 grams / 0.5 ounces
• 16t: 14 grams / 0.8 ounces
• 17t: 16 grams / 0.6 ounces
• 18t: 18 grams / 0.65 ounces