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Carbon Seatpost slipping


racman
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A question to the experts yet again - besides the obvious comments about being too heavy etc, etc, - how tight should one tighten the seatpost  clamp for a carbon seatpost?

I had to stop 3 times on Saturday due to the seatpost slipping down. The previous seatpost cracked and broke at the Tour Stellenbosch from someone overtightening (I think).

 

Is there any secret to avoid this slip - I noticed that the post had oil on from the pre-Argus service, which I heard sometimes caused CF to slip. Any ideas/help?
racman2007-03-27 07:35:52
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NEVER lube carbon parts. The liquid goes into the carbon and weakens it. Do you have a special carbon seatpost clamp? The are made so that you can tighten the post without being crushed.

 

 
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no Mampara - just the standard clamp that is on the frame. I didin't even know that there was a special clamp - where do I get one?

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You also get a special paste/lube to use on Carbon posts and handlebars (red in colour feels like sandy greece). Most decent bike shops use it.

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You do get proper Carbon Grease, ask Lea at Cycle Factory about it. And he should be able to tell you what it's supposed to be torqued to.

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Stupid question this - but where would you need to use lube (carbon-specific or whatever) on handlebars?

 

Can understand the seatpost - but the bars?
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RodTi - maybe so your hands don't get all "chapped" and blistered!!!Wink racman2007-03-27 07:49:29

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no Mampara - just the standard clamp that is on the frame. I didin't even know that there was a special clamp - where do I get one?

 

They basically look like this and any bike shop sells them.

 

Asymmetric Seat Clamp

http://www.totalcycling.com/images/image/19000_175011.jpg
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Stupid question this - but where would you need to use lube (carbon-specific or whatever) on handlebars?

 

Can understand the seatpost - but the bars?

 

Where you clamp the carbon bars onto the stem.
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A question to the experts yet again - besides the obvious comments about being too heavy etc' date=' etc, - how tight should one tighten the seatpost  clamp for a carbon seatpost?

I had to stop 3 times on Saturday due to the seatpost slipping down. The previous seatpost cracked and broke at the Tour Stellenbosch from someone overtightening (I think).

 

Is there any secret to avoid this slip - I noticed that the post had oil on from the pre-Argus service, which I heard sometimes caused CF to slip. Any ideas/help?
[/quote']

 

The old journey mans saying goes...

Tight is tight and to tight is F+*&ED - velly true for carbon bits.

 

Remove all previous oil / grease, and use only the correct lube as mentioned in previous posts, or no lube.

 

the manufacturer will recommend a torque for the seat post clamp, if you are not sure how much 25 inch lbs is beg borrow steal a suitable torque wrench and tighten to the correct value.

 

if the seat post is the original one that came with the bike it should be the correct dia, buts its worth checking to see what the dia is and that it is correct for the frame (check frame manufacturers web site).

 

If after 3 attempts to tighten it and it still slips then something is wrong (unless you did not tighten enough - but it sounds like you did), remove lube in frame and on post , check dia of post is correct for frame and tighten correctly.

 

 

 
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