I saw a Moots frame with a YBB at a cyclocross race in 2011, so it has been done. You can do it if you have the cash to buy one of their bikes or frames. I hear Moots make a nice bike, but I have not talked with anyone on the suspension frame.
Originally Posted by
fietsbob
Trek did a one off frame for Hincappie in Paris Roubaix, a few years back ,
George was a DNF that year , the alloy steerer on his CF forks broke
and he took a side trip into a drainage ditch.
Trek sold a carbon
Pilot s.p.a. bike with an elastomer in the rear to dampen the ride similar to the Moots design. A friend of mine owns that bike and recently purchased a new ride without suspension. He surmised that the frame flexing was robing him of some power. Since there is only an inch of travel and no hinges it can not be as lossy as a mountain bike rear suspension but yeah I watched his frame flex on every pedal stroke.
If you are looking for some additional cushion in the saddle, I would also recommend a suspension seatpost. They are removable if they do not provide an acceptable the weight to comfort ratio.