These suckers build up to between 18 and 21 pounds, depending on the rider and bike size. Sick. Gotto spend the big $, though.

Frame: Waltworks Custom Singlespeed w/Paragon SL sliding dropouts
Fork: Waltworks custom rigid
Headset: Chris King or Crankbrothers Cobalt SL
Stem: Ritchey WCS 4-axis
Handlebar: Easton Monkeylite SL
Brake levers: Shimano XTR
Grips: Ritchey WCS foam
Shifters: None
Front derailleur: None
Rear derailleur: None
Bottom Bracket: see cranks
Chain: SRAM PC-99
Cassette: Endless Bikes Kickass cog
Crankset: Shimano XT w/integrated BB and Spot SS chainring
Pedals: Eggbeater ti
Cables/housing: None
Seatpost: Easton EC90
Saddle: Selle Italia SLR
Brakes: Shimano XTR
Front hub: DT Swiss 240s
Rear hub: DT Swiss 240s Singlespeed
Front rim: Stan's 355 or Arch
Rear rim: Stan's 355 or Arch
Front spokes: DT Swiss
Rear spokes: DT Swiss
Rim strips: None
Tubes: Notubes Kit
Tires: Maxxis Ignitor front/rear
Skewers: Bolt-on

Total price: $3400

Suspension fork upgrades available, please email for details