Box One Oversized Single Speed Cog

The Box One Oversized Single Speed Cog is a CNC-machined chromoly cassette cog for BMX hubs with an oversized (OS) spline driver. A 5mm-wide inner base spreads load across the driver, and the ED black finish with laser-etched graphics keeps it looking clean. Available in 14T to 18T.

Features

• CNC-machined chromoly steel for long wear life
• Wide inner base increases contact with the driver and reduces driver wear
• Runs 3/32" or 1/8" chain
• ED black coating resists corrosion
• Laser-etched graphics

Specs

• Material: Chromoly steel, CNC-machined
• Finish: ED black
• Spline: Oversized (OS)
• Inner base width: 5mm
• Chain: 3/32" or 1/8"
• Weights:
  • 14T: 20g (0.70 oz)
  • 15T: 28g (0.98 oz)
  • 16T: 36g (1.27 oz)
  • 17T: 38g (1.34 oz)
  • 18T: 42g (1.48 oz)

Fitment

Fits OS spline drivers, including the Onyx Ultra SS Driver. Not compatible with standard Shimano spline drivers.

Shipping is often faster, but some items like this one can take 1–3 weeks to ship.