Join Date: Aug 2005
Location: New Hampshire
Bikes: Gunnar Sport, Soma Double Cross Disc
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Stripped bottle cage boss on CF frame. What repair options?
I've got a Motobecane CF frame which appears to have a stripped thread on the upper seat tube bottle cage boss. I've read about various repair methods (Riv-nuts, helicoils, etc.) but all the information I've found seems to be for metal frames, where the procedure is usually to drill out the old boss and put in a riv-nut. Is it pretty much the same for CF, and if so is it something a good LBS should have experience with? The bosses in my frame look like they could be Riv-nuts but I've never seen one except in pictures so I can't say for sure, and I don't know if those are commonly used in CF.
I'm pretty sure the damage is to the thread itself, not a loose boss. I think I cross threaded it at some point and it finally gave out. The bolt just sort of spins and won't take more than a finger-tight torque. I have it held in with the some blue loctite at the moment but it's loose enough that I can move the cage around a little with my fingers.