okay thanks. people's statements will help me come up with a hypothesis
their angle isn't that their green its that it . It has greater strength than steel, it produces a stiff frame for better power transmission, it is very good at damping vibration which leads to a smoother ride and it is also very damage tolerant
Although Bamboo has greater tensile strength (or resistance to being pulled apart) than steel respective to its weight in other areas the properties of Bamboo are less desirable. Bamboo swells and weakens dramatically with water absorption, in line with this the properties of the material change. I am yet to see a bike frame of a few years old that does not contain a scratch or marking on the frame, have you?.
On a painted steel surface history has shown us that this damaged is only cosmetic while on bamboo it will permit water into the untreated surface which permits the the structural integrity of the frame to be impacted.
Although Bamboo has exceptional strength respective to its weight, the fact remains you have no control over this strength or stiffness, you can not for example create areo profiles without impacting the strength of the structure, you can not induce different thickness or shapes into the construction to achieve the desired characteristics and weight.
It is for these reasons that the material is not used in aerospace extensively, or the wind turbine industry.... The engineers lack the ability to control and define how the structure delivers its properties, imho its good for scaffolding and reinforcing concrete, but not for a complicated structure like a high performance bike.
