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Hi, this is Sacki of BikeYoke speaking.
The idea behind this is nice.
However, please do not forget, that the bushings in your seatube will need to be extremly well calibrated and perfectly in-line with each other. If this is not the case, your post will get stuck or have play.
In the majority, we are still talking about aluminum frames (and they are having a comeback on high end bikes now, too). Those AL-frames are welded and suffer a certain amount of distortion after welding (heat). Seattubes naturally are not 100% straight.
Frame makers will (and they do) hate you for mekingg them produce a frame with that tight tolerances. Frame makers are not keen on doing this. At all.
Then, you are also restricted to certrain frame designs, as the seattube needs to be straight and can not have a bend. Implementing dropper into the frame will simply not work with most of the current designs on the market. Designs like the new Santas, EVIL, the new Spesh Enduro (which IMHO are amongst the top-performing suspensions) are simply not compatible. And so are more than 90% of other frames.
So again: The idea is good, but at the moment an integrated dropper requires too much compromise on top-performing rear-suspension. Droppers need to go up and down reliably. That is what the customer cares about. Who would sacrifice kinematics performance for an integrated dropper that does not make a reall difference for the ride experience.
P.S: You may want to check in some forums or with some owners or dealers and ask them about reliability, then you may know, why I personally do not think, that it is a good idea.
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