Flip-flop design lets you run 2 separate freewheels then turn the wheel around if you need to "change gears". The burly shell is machined from forged aluminium and the hub runs on a quick release chromoly bolt-on spindle that stays where you put it. Seated between the two are angular contact sealed cartridge bearings for a smooth, maintenance-free ride.  You get the idea. They work good, and look good. ‘Nuff said. Here are all the options:

Features:

• Rear Disc, 10mm solid Cro-Mo axle
• 135mm Spacing
• One side threaded for Fixed cog (with L/H lockring threads) and other side with standard English threads (1.37"x24Tpi)
• Color:Black 
• Forged and CNC-machined hub body
• strong, medium-flange design.
• Adjustable, Angular Contact sealed bearings 
• 32 hole
• Easily replaceable and available bearings and axles
• 328 grams