Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Senior Member darrencope's Avatar
    Join Date
    Mar 2003
    Location
    Perth, Ontario, Canada
    My Bikes
    Colnago Classic, Kona Dr. Dew, Giant ATX 740, Bianchi Strada, Eclipse Time Machine
    Posts
    338
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Stripped F. Derailleur Cable Anchor Thread

    Hi all,

    I managed (through my own stupidity) to strip the thread on the cable anchor bolt hole on my front derailleur (Suntour Cyclone M-II circa 1983). So now, I can't fasten down the bolt tight enough so that I can apply pressure to the cable...it just slips out when I move the lever.

    My question - is there any way to fix a stripped thread like this? I have read about using Teflon plumbers tape to stop things from squeaking. Would a few extra layers of this help with my problem by "filling in" the threads? I'm doubtful, but it's the only option I can think of, short of re-drilling a larger hole and re-threading it, which I would like to avoid if possible (how easy is this to do on this type of aluminum?) Any other options, or should I just start looking to buy a replacement derailleur? If so, how do I tell what types will be compatible with what I have?

    Thanks for any and all replies!

    Darren

  2. #2
    Career Cyclist threadend's Avatar
    Join Date
    Feb 2002
    Location
    Michigan, USA
    Posts
    551
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by darrencope
    Hi all,

    My question - is there any way to fix a stripped thread like this?

    Your answer - re-drilling a larger hole and re-threading it
    Darren
    Investigate an SAE size thread slightly larger than the current metric bolt (or vice versa), you might get away with only running a tap and not have to drill the hole.

    BTW - Be sure to use a fine, not course thread.

    Best wishes, it worked for me when I did the same to my r'der.

    T/E
    2003 Iceman Challenge - 2:34:55 - 897 / 2,000*
    2002 Iceman Challenge - 2:39:23 - 1093 / 2,186
    2000 Iceman Challenge - 2:49:18 - 1516 / 2,153
    *estimated

  3. #3
    hello roadfix's Avatar
    Join Date
    May 2003
    Location
    Los Angeles
    My Bikes
    thank you for asking
    Posts
    18,502
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You can drill through the hole and simply use a bolt, washer, & nut to secure the cable......or, you can maybe find a replacement here:

    http://cgi.ebay.com/ws/eBayISAPI.dll...category=27950
    .cinelli.olympic.surly.long.haul.trucker.kona.ku.surly.steamroller.
    .litespeed.classic.litespeed.firenze.bianchi.pista.dean.colonel.plus.more.

  4. #4
    sch
    sch is offline
    Senior Member
    Join Date
    May 2003
    Location
    Birmingham. AL
    Posts
    2,589
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Rethreading a slightly larger hole should be trivially easy. You need to ID the screw size now used (probably 4 or 5mm x 0.8mm) and find a replacement screw the right length and configuration. The clamping washer may need to be drilled out as well. Once the screw is found there are standard tables of drill sizes used to drill a hole for a given size tap. Taps in the right size will be $2-4 depending on source, or as low as $1 from a few sites. Try to find a screw with an allen head for convenience. Do NOT use straight slot screw (unless hex head) and avoid phillips head as they tend to strip easily. Robertson head is great but few bike tool kits have the tool. You will need a tap holder, it is amazingly easy to cross thread the start on taps, though Al is not much of a problem, you can't do it with a wrench. Taps have square ends so a brace might work in a pinch. You do have a brace as in brace and bit (obsolete hand powered wood drill.)? Steve

  5. #5
    Forum Admin lotek's Avatar
    Join Date
    Dec 2001
    Location
    n.w. superdrome
    My Bikes
    1 trek, serotta, rih, de Reus, Pogliaghi and finally a Zieleman! and got a DeRosa
    Posts
    17,623
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Just buy a new one. They are not too expensive and
    fairly common on e-buy.
    Here are 2 that I found today. both less than $20.00, 15 should be
    close to winning bid.

    http://cgi.ebay.com/ws/eBayISAPI.dll...category=27950

    http://cgi.ebay.com/ws/eBayISAPI.dll...&category=2904

    Marty
    Sono pił lento di quel che sembra.
    Odio la gente, tutti.

    Are you a registered member? Why not? click here to register. Its free, and only takes 27 seconds!
    Want to upgrade your membership? Click Here.

  6. #6
    The Red Lantern Rev.Chuck's Avatar
    Join Date
    Apr 2003
    Location
    Raleigh NC
    Posts
    5,967
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Look close at the der., quite a few front ders. have a nut swaged in. On these you can rest the arm against a vice opened just enough to let the nut pass and tap it out then tap a new one in.
    Are you a registered member? Why not? click here to register. Its free, and only takes 27 seconds!
    Help out the forums, abide by our community guidelines.

    I am in the woods and I have gone crazy.

  7. #7
    Senior Member darrencope's Avatar
    Join Date
    Mar 2003
    Location
    Perth, Ontario, Canada
    My Bikes
    Colnago Classic, Kona Dr. Dew, Giant ATX 740, Bianchi Strada, Eclipse Time Machine
    Posts
    338
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hi guys, thanks for all of the above advice. However, I've been putting off doing anything about this, and was thinking it's about time I did. Since I'm not too sure about doing this myself (don't want to ruin anything any more than it already is...) is it reasonable to take it to a shop for this type of job? Do they have the tools to rethread or whatever is necessary? I guess I could call the LBSs and see what they say, but I'd like your opinions too!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •