The Forty Brothers have a frame out at united Bike Co and the lastest version, called the 40HT frame 2009, received the full post welding UV1 heat treatment. That brings the weight down to 4.4 LBS or 1.9 Kilograms. It's got removable brake mounts and guides, huge tire clearance and you have the choice of a 20.6,

a 21 & 21.25" top tube. Back end: 13.75" to centre chain stays. 74.5 degree head tube angle. 11.8"B/B height and double butted tubing throughout. Lots goes into making frames, huh? The Forte brothers decided to go with oval chain stays, laser cut bridges, smaller diameter tubing than on their regular 40 frame. Laser cut drop-outs on this one with rounded cut out holes. What else? An integrated seat clamp with sunken nut/bolt system. Comes in flat black and it has a lifetime warranty. Dang!
www.UnitedBikeCo.com