I rarely have to switch out of the big ring (no climbs local)....anyway I went out to jump on the bike for a ride today and noticed the front derailleur bolt that holds the cable had broken off clean. Odd, since I never really use the small ring and did not bump it.
Glad it happened at home than on a ride, I noticed it when I went to lube the chain and when I spun the crank it popped off the chain.
So, how do I get the rest of the bolt out if the head fell off? Can I use a screw extractor (was googling)?
I've never had this type of issue before and want to not ruin the ultegra front dérailleur! Any help or insight would be appreciated.
I think I drill a small pilot hole and then use a screw extractor set? will need to be so precise as the bolt is so small.
Time for a trip to either your LBS, or (better yet) your local machine shop. Machinists usually have clamps and vices that can stabilize most odd-shaped items, and drill presses that are worlds away in accuracy of most home shop tools.
A good machine shop would probably be able to bore a pilot hole and "easy-out" the bolt shaft. I don't think it would cost too much.
I rarely have to switch out of the big ring (no climbs local)....anyway I went out to jump on the bike for a ride today and noticed the front derailleur bolt that holds the cable had broken off clean. Odd, since I never really use the small ring and did not bump it.
Glad it happened at home than on a ride, I noticed it when I went to lube the chain and when I spun the crank it popped off the chain.
So, how do I get the rest of the bolt out if the head fell off? Can I use a screw extractor (was googling)?
I've never had this type of issue before and want to not ruin the ultegra front dérailleur! Any help or insight would be appreciated.
I think I drill a small pilot hole and then use a screw extractor set? will need to be so precise as the bolt is so small.
Remove the derailleur from the bike.
Center punch, drill/bit, extractor, steady hand, and patience.
As far as I know, almost all Shimano front derailleur cable pinch bolts thread into a steel nut loosely placed into a counterbore on the pull arm. If this is true on your derailleur as well, just push the bolt remains and the nut out. You may have to file off a burr or two where the bolt head used to be.
I had a better look today and cleaned out all the road junk (Canada winter beater bike Cervelo 2009 S1) and where the head broke off it was clean/flush with where the threads begin but mine does have the bolt on the back.
In this case give it a test on pushing it out, while it is still on the bike (punch and few light hammer taps). If this doesn't work take it off and place the part on a wrench socket (just larger than the nut but still supporting the surrounding metal) and tap it with a punch and hammer.
Inside the derailleur it is not really a standard nut. The whole where the nut would sit in is round, and inside it has grooves like a star where the nut would grab onto. I'll post a pic later tonight.
As promised a pic of the hole the bolt sits in. Not a standard nut, I think i might just be able to get away with something that does not sit in the whole fully but just would bind up against the hole as I just need to pin the cable inplace. odd that I can't find a bolt nut combo online....grrr.
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Originally Posted by superflylondon
