Seatpost Failure

See other failures under 000.html.

AX-Lightness Daedalus carbon-fiber seatpost failed at transtion from shaft to head, near embossed logo. From http://cozybeehive.blogspot.com/2008/09/ax-lightness-daedalus-seatpost-failure.html and http://weightweenies.starbike.com/forum/viewtopic.php?t=47147&postdays=0&postorder=asc&start=0 as of 2010/04.

                    

Rider was uninjured — noticed the saddle had moved, and stopped to check.

Rider weight 75 kgf, maximum rated weight 85 kgf. Bolt torque rated at 6 N-m, actual torque not stated although one poster asked.. Used in cyclocross; rated for both road and MTB use.

Service history unknown, but the rider reports it was his second ever cyclocross race, suggesting limited cyclocross use.

The post appears to have failed along a logo embossing line. The depth of the embossing appears to be substantial compared to the wall thickenss of the post.

Since installation torque was not given, it is possible the clamp was overtightened, contributing to the failure.

The maker reportedly wrote

Hello roberto,

with reference to your email we are unable to accept your complaint.

We would like to inform you, that our products are developed for riding, road and MTB. At cycle cross, the rider continues jumping onto the saddle, witch is special in this sport. This causes unusual forces.

You should use massive metal parts, not elements made from fibre materials for your sport.

Mit freundlichen Grüßen/With best regards

i. A. Jutta Bauer

Another poster reports

I've had 3 daedalus posts and 3 broke, all cracked at the edge under the half pipe. No off road, no Roubaix cobbles, never went over half the torque limit on the clamp, and weigh at most 64kg. First one wasn't replaced by AX, didn't bother trying on the other 2.