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How to avoid over-tightened seatpost clamp?

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How to avoid over-tightened seatpost clamp?

Old 07-30-12, 10:54 AM
  #1  
boggy
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How to avoid over-tightened seatpost clamp?

My bike was fitted in the shop, and I noticed that seatpost lowered after some rides. I do have a picture of what it was like after the fitting, so I can put it back up, but I am afraid of tightening the crap out of it because this is carbon fiber frame. How do I do this properly?
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Old 07-30-12, 10:58 AM
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torque wrench
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Old 07-30-12, 10:58 AM
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I use a torque key similar to this http://www.probikekit.com/ca/tools-m...y-torqkey.html it clicks once it reaches the correct tightness.
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Old 07-30-12, 11:05 AM
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Torque wrench... note that when you are checking the torque you need to back off the bolt and re-torque it.
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Old 07-30-12, 11:13 AM
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Also, they make a special paste for just such an application. It doesn't react with the CF and has a bit of grit to reduce the torque required. I'm surprised they didn't apply some when they did the fit.
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Old 07-30-12, 01:34 PM
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Old 07-30-12, 01:42 PM
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Torque keys seem kinda lame. Men should own a torque wrench or two

I use the grit assembly paste ( http://www.amazon.com/Finish-Line-Bi...assembly+paste ) and just tighten to probably half the max torque spec. No need to go full tight, it's the max torque, not the recommended torque.
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Old 07-30-12, 02:06 PM
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Originally Posted by jmX View Post
Torque keys seem kinda lame. Men should own a torque wrench or two

I use the grit assembly paste ( http://www.amazon.com/Finish-Line-Bi...assembly+paste ) and just tighten to probably half the max torque spec. No need to go full tight, it's the max torque, not the recommended torque.
http://www.amazon.com/Pedros-TOOL129.../dp/B001Q23UPI

I bought this one....i love it. I love it even more because I used race re-reimbursements from my team to pay for it...but still.
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Old 07-30-12, 02:15 PM
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Originally Posted by Nassa View Post
I use a torque key similar to this http://www.probikekit.com/ca/tools-m...y-torqkey.html it clicks once it reaches the correct tightness.
Torque spec on that bike may be less than 5nm, which the key is set for. IIRC, the seatclamp on my P2, which is a similar design sets the maximum torque at 4nm.

Honestly though, if you have a decent feel for how tight things should be you can tighten a seatpost without a torque wrench. Use CF assembly paste, tighten the bolt enough to keep the post from slipping, without being hamfisted, and you're done. As JMX said its a max torque spec, no need to tighen the bolt more than what it takes to hold things together.
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Old 07-30-12, 02:16 PM
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$5 fish scale attached to the appropriate hex wrench and a bit of arithmetic works well.
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Old 07-30-12, 04:10 PM
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Originally Posted by merlinextraligh View Post
Torque spec on that bike may be less than 5nm, which the key is set for. IIRC, the seatclamp on my P2, which is a similar design sets the maximum torque at 4nm.

Honestly though, if you have a decent feel for how tight things should be you can tighten a seatpost without a torque wrench. Use CF assembly paste, tighten the bolt enough to keep the post from slipping, without being hamfisted, and you're done. As JMX said its a max torque spec, no need to tighen the bolt more than what it takes to hold things together.
In addition to this, put a little grease on the threads of the fixing bolt. It will come up to torque more smoothly and consistantly.
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Old 07-30-12, 04:13 PM
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Originally Posted by Clipped_in View Post
In addition to this, put a little grease on the threads of the fixing bolt. It will come up to torque more smoothly and consistantly.
And more tightly too.
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