Bicycle Mechanics - FSA K-Force Seatpost Problem
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12-12-07, 08:33 PM
I just got a new K-Force seatpost, the 32mm setback version. I installed it, but did not have a torque wrench, so I tightened it down, tight. Riding today, it made a popping sound, then dropped all the way back (my voice is an octave higher, but otherwise I am ok). I adjusted it again, 20 miles later, same thing. Is there some trick to adjusting these? They have a a two-bolt tightening system like a Thomson (which I would have bought if they had one with the setback I need). Beyond torquing it down to the exact specs, is there some trick to setting these up? I am sure I had it at least as tight as they suggest. Thanks in advance, my crotch can't take another experience like the last two.
12-12-07, 08:48 PM
If it's a carbon seatpost, which I think it is, then you can apply some carbon assembly grease. It prevents the joined pieces from slipping. There are a few companies selling the product. Mine is called Dynamic Assembly Compound Carbon, sold by Tack.
12-12-07, 08:55 PM
Thanks, it actually came with some, and I used it. I was really surprised that it did not help.
12-12-07, 09:34 PM
you are talking about the tilt adjustment right?
Just tighten that down until the seat doesn't move. Alternate between the front and rear bolt till its just about right. Then you can fine tune the tilt by just tightening/loosening one or the other till its perfect.
Once its tight, its easy to make adjustments to tilt. Turn out a 1/4 turn on one, and tighten a 1/4 turn on the other.
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