Ruegamer UberLight Carbon Tandem Frame Size: Caption Center to Top - 56cm, Stoker Center to Top - 53cm (see detail frame dimensions in the photos). Frame only Weight: 2090kg Rear stay spacing: Std. Road 135mm Seat Post: 28.6mm (both) Carbon Rear Drop-out with Wheels Mfg. Hanger - Calfee has added Reinforcement to the Rear Stays & Drop-outs joints. Carbon Front BB Shell Threaded Aluminum Insert Rear BB Shell Frame has 4 Water Bottle Mounts. Includes 1 1/8 inch Alpha Q X2 Tandem Fork, that has the Aluminum Threaded Steerer Insert installed into the Carbon Steerer (no star nut is used). Includes integrated FSA Revolution Ceramic Bearing Headset with Chris King Headset Cap. Includes Aluminum Bushnell Feather Weight Eccentric Includes Parlee Carbon Front Derailleur Mount Includes a set of Light Weight Seat Post Clamps I think this was the last completed Frame Ruegamer Built before they stop custom Production in early 2010! I had this frame/complete bike build at 22.5 lbs, when I changed tandem partner...frame was then to large for the new stoker! Frame has Less then 250 miles on it! A New Calfee "Dragon Fly" w/o Fork is ~$8,600 Additional photos on request! Please contact me with any & all question!