Forum home Road cycling forum Workshop

Downtube shifter bolt broken

rolf_frolf_f Posts: 16,015
edited February 2011 in Workshop
Set off on my nice 70 miler today on the old Dawes. Got less than one mile and 'ping' off comes the left side downtube shifter lever. After searching to find the bits that had come off, I hurried home, changed bikes, did the run and have now got back. To reality. And one broken Dawes :(

Anyway, I potentially have a source for a replacement lever but the question is - how easy is it to extract the broken bolt end. I don't think I'll have a go myself as I don't want to end up making a mess of a nice bike so I'll probably bob it over to Spa Cycles this week. But I would like to know that it is a straightforward job :lol:

Presumably just a case of carefully drilling the bolt stub out?

Also, is there likely to be any issue over braze on mounts? The lever is Sachs Huret from 1990 and I'd like to get similar to replace it.

Thanks in anticipation!

(Edit: at least it had the decency to brake near home - being stuck on a single ring on todays route would have been tedious!)
Faster than a tent.......


  • sungodsungod Posts: 13,877
    if the thead goes all the way through and out the other side then you can drill a hole in the end of the snapped bolt and screw another, smaller, bolt into it to drive it out

    otherwise drill a hole in the end and use a screw extractor, like... ... ps-sellers

    it's straightfoward to do, although with small bolts it needs care to drill the hole without damaging the surroundings, use a new bit and go easy

    a dremel or something similar would be ideal i reckon, but i've done it with a normal powerdrill on an m5 stem bolt, was ok

    if there's a chance the old bolt is gundged up, put some acf-50 or penetrating oil on it and leave for a day before trying to get it out
    my bike - faster than god's and twice as shiny
  • rolf_frolf_f Posts: 16,015
    Thanks for that. I'll see how much Spa will charge and then decide if I have a go! I have a feeling that the bolt hole isn't blind (I'll get the other side out and check in a bit). It certainly won't be bunged up - I only just refitted it in January but presumably overtightened it (though the fracture looks a bit crystalline...). Am wondering if I can just get a replacement bolt...........
    Faster than a tent.......
Sign In or Register to comment.