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I built a bamboo bike that theoretically should be quite cushioned through the seat stays since I used more flexible tubes there. I made no effort to inordinately beef up the bottom bracket nor are the chainstays remarkably stiff.
I made it so the rear wheel practically brushes the seat tube. When traveling over the roughest roads the rear wheel hasn't shown even a hint of so much as brushing the seat tube as any flexion occurs.
The concept of a bike being stiff and yet flexy is probably based on such minimal frame movement as to be almost total bs.
Having said that the bike is still forgiving but I think that's based on total frame distribution of vibration rather than having some sort of shocks effect.
 
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