It seems that if Im in the aero position and I go over some decent bumps, the aerobar ends up rotating downward at the stem. Im afraid to overtighten the stem bolts due to the carbon bars. Is there a trick to get them to locked in the right angle?
BTW setup is 26mm syntace f99 stem – Easton attack TT bars
Use torque wrench.
If it doesn’t stay put when torqued to spec, then you have a mechanical issue that should be examined by your LBS.–FT
Tighten the bolts tighter and place less weight on the end of the extensions and more on the pads. T = r x F
Use torque wrench.
If it doesn’t stay put when torqued to spec, then you have a mechanical issue that should be examined by your LBS.–FT
x2. If it’s carbon-carbon, you might put some carbon paste on there as well. Not sure if the stuff can be used for Al-carbon.
Second the assembly paste. And especially for alu-carbon.
http://www.cswestbikes.com/servlet/the-817/FSA-Carbon-Fiber-Assembly/Detail
p.
hellovelo.ca
I had trouble keeping my Easton’s from pivoting downward too even at about 20% more torque than was suggested on the stem for the stem bolts. I also carefully backed the torque off the bolts and then re-tightened them. It was a two bolt Easton clamp stem and didn’t seem to have enough clamping force. I switched to a Deda stem with four bolts tightened in an “X” pattern like an engine head’s bolts are supposed to, the valve cover thingy, to hopefully put some more clamping force on the bars.
They still slipped.
I replaced the first two stems with some other stem, oh, it was one of those Thor Hushovd stems distributed by Shimano- what the tarnation is the name of that company? Ach… I can’t remember. Anyway, it was that nice looking Thor Hushovd signature stem by whoever and that held.
I also used some of that friction paste, the gritty stuff, bronze colored. That likely helped.
“PRO”, that’s the company that makes the Thor Hushovd stem, an alloy stem, it is a four bolt clamp.
Ultimately, I suspect the Eastons may be very slightly undersized.