Test duration: Several specimens in test bikes from different manufacturers
PLUS: Support reacts very sensitively to clamping load from the saddle clamp
The carbon seatpost "K-Force" from FSA for 150 euros looks classy and offers a large horizontal adjustment range for the saddle. However, according to our observations, longitudinal cracks in the saddle clamp area occur remarkably frequently. An exemplary examination of a post of this type (diameter 31.6 millimetres) showed that these cracks can occur even with a frequently required tightening torque of 7 Newton metres. We recommend two things to owners of this seat post: Always check your model for cracks - and replace it if necessary. If the seat post is still intact, use the torque spanner - initial setting 3 Nm - to feel your way in small steps towards the point at which it will hold securely. When this point is reached also depends on the construction of the seat tube and the clamp and cannot be generalised. Never exceed 6 Nm. Tip: The tightening torque required for secure clamping can be significantly reduced with special assembly paste for carbon parts. Such pastes are commercially available from Dynamic, Tacx and Ritchey, among others.
Reference/Info: MCG; phone 07159/945930; www.fullspeedahead.com
