White Industries DOS Freewheel
It's a two-cog freewheel for Quickbeam / Simpleone and other single-speed bikes. Machined, precise, smooth, sealed, quiet, perfect, and pretty. After seeing how much it costs, you might think it wins the prize for the most dollars per cog of any freewheel ever made, but you'd be wrong there; White Industries also makes a single-speed freewheel that's a little cheaper. If you ride your derailleur-less bike a lot and in hilly places, it's a good toy. Changing gears with hands is a cinch. Available in 16x18, 16x19, and 17x19.
Note: The 16x19 is recommended only for our Quickbeam / Simpleone since the large cog difference results in lots of wheel movement to take up the chain slack. Only our Quickbeam / Simpleone, with their special angled dropout, can handle that much wheelbase change without the brake pads getting too out of place in relationship to the rims.