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That's such a cool frame! Ive not seen a clamp like that before. Does the screw tighten directly onto the seat post?
Biggles567-
Yes indeed, that is why I was a bit worried as the screw is "pinching" (not sure the term is correct, I think it would be a grub screw in english) directly the seatpost, I didn't want to destroy the seatpost (it leaves quite some marks as the seatpost is in aluminium and the screw in steel). Therefore the idea would be to have a less destructive design haha
This clamp design was vastly used here in France on MBK frames ; the one I have was a specific paintjob for a pro team back in the 90's (MBK Vetta or Chazal, can't remember exactly and I'm no expert) I've just changed the fork for a straight one
EDIT: base model name for this design was "MBK Mirage", and it has funny aspects like the top tube that changes shape towards seat tube.
With OG fork it kind of looked like that (in less better conditions)
paulbiche
Not quite sure the place is the right one to ask, but i'll try my luck.
I have a frameset that have a clamp of the seatpost that probably not the most robust design:
There is a screw at the end of the top tube that lock the seatpost in place.
A closer look:
I was afraid to overtighten it, and at the end of a ride it slipped and the seatpost went down the seat tube (hopefully, it was at the end of the ride near my place). I re-set the height and tighten the screw quite a bit more, and it hasn't moved since (but I've not rode it much).
Is there any solution to this? I have a framebuilding company not far, so I'll probably ask them but as it is on appointment only and with a 45mn drive, I reckoned it was interesting to ask on here before.
What would be the potential solutions to have a better seatpost holding solution?
Change the complete seat tube (but would be a pain I believe since it go through the top tube)?
Manufacture a seatpost with an expander (like a stem)?
Buy a steel seatpost (if that's even a thing), tighten the screw hard and not worry about it?
Thanks in advance for any ideas!