Dear sir, The bike was the second I have built. The first was made of steel tube, and was, and still is, used as a testbed, to confirm handling, clearances etc. I now have a third machine, which is a further refinement, and may possibly be approved by the UCI. The chain, pedals and wheels are commercially available parts. The rest is designed by me and is built by various experts in their particular field. Frame, handlebars, seat, forks, chainring and cranks are carbon. Hubs, bottom bracket, headset and sprockets are titanium. There is some aluminium used. Hubs are machined out of the existing wheels and replaced with titanium inserts. The bearings are placed in the frame- chain tension is adjusted by a cam. The crank, on the offside, sits within the chainring. On the first machine the pedals were attached directly to the carbon chainrings (there was one on each side of the bike) and the teeth were cut into the carbon. We have had no problems with this arrangement. The bike is extremely narrow with the front fork legs approximately 25mm apart, the rear hub is approximately 60mm wide, and the pedals about 80mm apart. We have no trouble with riding in this configuration, but we are only interested in going ar 35MPH. There are 100 teeth on the chainring and 19 to 24 teeth on the rear sprockets. I hope this is of some interest. Regards Mike Ellis (UK)