How to avoid over-tightened seatpost clamp?
07-30-12, 10:54 AM
#1
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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?
07-30-12, 10:58 AM
#3
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I use a torque key similar to this https://www.probikekit.com/ca/tools-m...y-torqkey.html it clicks once it reaches the correct tightness.
07-30-12, 11:05 AM
#4
Bicycle Repair Man !!!
Torque wrench... note that when you are checking the torque you need to back off the bolt and re-torque it.
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.
07-30-12, 01:42 PM
#7
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Torque keys seem kinda lame. Men should own a torque wrench or two 
I use the grit assembly paste ( https://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.
I use the grit assembly paste ( https://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.
07-30-12, 02:06 PM
#8
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Torque keys seem kinda lame. Men should own a torque wrench or two
I use the grit assembly paste ( https://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.
I use the grit assembly paste ( https://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.
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.
07-30-12, 02:15 PM
#9
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I use a torque key similar to this https://www.probikekit.com/ca/tools-m...y-torqkey.html it clicks once it reaches the correct tightness.
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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07-30-12, 04:10 PM
#11
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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.
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.
07-30-12, 04:13 PM
#12
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And more tightly too.
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"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --the tiniest sprinter
