Which brings us to the bicycle frame. In our opinion a bicycle frame should be stiff enough to be energy efficient but compliant enough to be comfortable to ride. We believe that to a large extent frame flex, particularly in a vertical axis is the suspension of a bicycle. So believing that it is ok to allow the bicycle frame to have some give to it, the material that you build the frame out of should have a high degree of fatigue strength. Look in any racing engine and we bet you'll find titanium valve springs.
Titanium is a fairly machinable and weldable material.
Our greatest hurdle was the availability of titanium frame building components. All of the parts you seldom think about were very limited in availability, i.e. braze-ons, drop outs, bottom brackets, and head tubes. There are only a couple of actual manufacturers of titanium component parts and we were not satisfied with the quality of the components that were available. So we set about developing the highest quality frame building components possible. We are doing the complete job ourselves titanium components and frames.