How tight should 6....
 

[Closed] How tight should 6.2nm torque feel? (seatpost clamp on carbon)

 jhw
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I don't have a torque wrench - just wondering if I've done it too tight. I tighten until I get significant resistance, and then a bit more, proper tight-like (but not so much that I'm swinging off the wrench). I previously was more cautious (left out the "bit more") but I found the seatpost would sink by 2-3cm in the course of a ride.


 
Posted : 12/03/2011 3:55 pm
 br
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Buy a Ritchey Torque Key


 
Posted : 12/03/2011 4:08 pm
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There's some stuff you can get to stop it slipping.... Carbon Assembly paste. Better than overtightening.

Have a look here...
http://www.competitivecyclist.com/review-lubricants/Tacx-Dynamic-Carbon-Assembly-Paste.388.html


 
Posted : 12/03/2011 4:09 pm
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Less than a nurfle but more than a shiflem.

Sorry but it's basically impossible to describe differently.


 
Posted : 12/03/2011 4:17 pm
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6 nm is not much at all. thats about as accurate I can describe it


 
Posted : 12/03/2011 4:20 pm
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Use a 100mm long hex key.
Arrange the bike so that the long arm of the hex key is horizontal.
Hang a 620g weight off the end of it.
That's 6.2Nm that is. Or somewhere near.


 
Posted : 12/03/2011 4:28 pm
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As with all bolts, just tighten until you feel it strip and then back off quarter of a turn.


 
Posted : 12/03/2011 4:55 pm
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This is carbon remember, so it's tighten until you hear a cracking noise, then back off a quarter turn.


 
Posted : 12/03/2011 5:08 pm
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I always feel obliged to repeat my carbon warning/info blurb in threads like these........

My very first carbon torque experience resulted with internal cracking ergo risk if delaminating and inevitable trip to the bin!
Others will disagree with me, but carbon servicing is a 'black' art and following different EM guidelines will end in expensive tears.

You'll be very surprise and how little torque you'll need to clamp things up, the classic being the carbon frame and carbon seat post.

I might add that all my carbon 'fettling' was gained in the road bike world.

My advice would be to tweak things up, then test ride on the flat over short course with tools. This approach will rapidly develop your carbon 'touch' and you then 'feel' when it's tight...

The innuendo within the above is limitless ๐Ÿ™„


 
Posted : 12/03/2011 5:12 pm
 jhw
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Thanks, I've loosened it right up until I can get hold of a torque key


 
Posted : 12/03/2011 6:34 pm
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Use a 100mm long hex key.
Arrange the bike so that the long arm of the hex key is horizontal.
Hang a 620g weight off the end of it.
That's 6.2Nm that is. Or somewhere near.

Pedant warning ๐Ÿ™„ ๐Ÿ˜›


 
Posted : 01/04/2011 9:22 am
 bonj
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somewhere between "fairly" and "moderately" tight. Definitely less tight than "very" tight, however.

Seriously though, what i often do if i haven't got my torque wrench to hand is to use a T-handled allen key, but use the long end, so I am only turning using the short end, and only using thumb and forefinger on about a 6cm length of it. Torque is Newtons times metres, if you reduce the metres, you reduce the torque.


 
Posted : 01/04/2011 9:57 am