Carbon fiber "wrapped" seatpost. Torque wrench necessary?
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Carbon fiber "wrapped" seatpost. Torque wrench necessary?
I picked up a FSA Carbon Pro seatpost. It's really 6061AL "wrapped" with carbon fiber for added strength.
Question: Can I just blast away and tighten this thing down as with any other aluminum seatpost, or do I have to handle the carbon fiber "wrap" on this with the same care as full carbon?
Question: Can I just blast away and tighten this thing down as with any other aluminum seatpost, or do I have to handle the carbon fiber "wrap" on this with the same care as full carbon?
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I guess I should add that this FSA seatpost is going on an aluminum frame (Xtracycle build) as well.
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Sounds like the worst of all worlds for seatpost construction. The torque sensitivity and slipperyness of carbon and the weight of aluminum.
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My only concern is will I crack the outer carbon wrap in some sort of weird way if I over tighten this? I do have a torque key that I could keep on the Xtracycle if it comes to that I guess?
Last edited by Sundance89; 09-26-11 at 08:38 AM.
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Well here's my deduction. I will assume by having AL at the center of the seatpost, this will eliminate the carbon wraps ability to flex and break. And because carbon fiber is basically plastic, it's not going to crush and break like glass against the aluminum when pressure is added. So I'm opting to be less cautious on tightening.
If I suddenly find that I can sing falsetto like the Bee Gees, you'll know why. (And just shoot me if that happens too.)
If I suddenly find that I can sing falsetto like the Bee Gees, you'll know why. (And just shoot me if that happens too.)
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I picked up a FSA Carbon Pro seatpost. It's really 6061AL "wrapped" with carbon fiber for added strength.
Question: Can I just blast away and tighten this thing down as with any other aluminum seatpost, or do I have to handle the carbon fiber "wrap" on this with the same care as full carbon?
Question: Can I just blast away and tighten this thing down as with any other aluminum seatpost, or do I have to handle the carbon fiber "wrap" on this with the same care as full carbon?
Even the pros should use a torque wrench as well, but let's not get into that discussion as it's already been hashed out many times here on BF.
#9
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Make sure the frame tube ID is smooth, Carborundum paper or cloth around a dowel ,
inside the seat tube. so you don't unnecessarily gouge the post.
inside the seat tube. so you don't unnecessarily gouge the post.
#11
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I've used the Ritchey torque key before. And then used a regular allen wrench. It seemed to me that by using a normal length allen wrench and tightening it to the point where there is resistance but you're not straining at all, I could achieve pretty darn close to the 5nm of the torque key.
I don't think tightening this Al/C seatpost is a big deal. Just use a friction paste and tighten with an allen key at a reasonable level.
I don't think tightening this Al/C seatpost is a big deal. Just use a friction paste and tighten with an allen key at a reasonable level.
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