robjh
Legendary Member
- Location
- Cambridgeshire - almost Essex
I recently acquired 2nd-hand a bike with a Selcof Monocoque MC04 carbon seatpost
Looks great, but every now and then when going over a bump there will be a loud crack, and the saddle has shifted backwards on the rounded platform at the top of the post, and now has its nose in the air.
No amount of tightening the 2 bolts seems enough to hold it for long, and in fact has got worse recently as I've been taking it apart and refitting it to look for the problem.
Should I be looking for some kind of carbon gripping paste, or are there simpler mechanical tricks that I'm missing?
Some more pictures of the thing :
1) saddle clamp in position, after slipping backwards (hence funny saddle angle)
2) the rounded platform that the saddle clamp sits on, with 2 holes for bolts. The position on the platform determines the angle of the saddle. The surface is roughened but no ridging or anything.
3) underside of the part of the saddle clamp that fixes against the seatpost surface(above). Again, slightly roughened but no more than that.
4) the 2 fixing bolts, from underneath. The 2 square washers are not entirely flat, but shaped to fit against the non-flat cavity surfaces.
Looks great, but every now and then when going over a bump there will be a loud crack, and the saddle has shifted backwards on the rounded platform at the top of the post, and now has its nose in the air.
No amount of tightening the 2 bolts seems enough to hold it for long, and in fact has got worse recently as I've been taking it apart and refitting it to look for the problem.
Should I be looking for some kind of carbon gripping paste, or are there simpler mechanical tricks that I'm missing?
Some more pictures of the thing :
1) saddle clamp in position, after slipping backwards (hence funny saddle angle)
2) the rounded platform that the saddle clamp sits on, with 2 holes for bolts. The position on the platform determines the angle of the saddle. The surface is roughened but no ridging or anything.
3) underside of the part of the saddle clamp that fixes against the seatpost surface(above). Again, slightly roughened but no more than that.
4) the 2 fixing bolts, from underneath. The 2 square washers are not entirely flat, but shaped to fit against the non-flat cavity surfaces.