Advertise on Bikeforums.net



User Tag List

Results 1 to 12 of 12
  1. #1
    Newbie
    Join Date
    Jun 2008
    Posts
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    threads are no good on my bottom bracket, but i must save this bike

    I have a used Motobecane from the late 70s, i think. it has been riding well for three years, but after a small accident the bottom bracket has become very loose. I took it to the shop and they cannot seem to find a new bracket that will screw in tight enough... the frame looked like it could be re tapped to fit a new bracket, or just held in by some jb weld...the loosness wasnt that bad really and I could still ride around on it alright.

    this is worth fixing to me, bc i cant afford a new frame right now, and because i like this frame a lot. and the bike just means a lot to me

    so my question is... how can i hold this bracket in place?
    will it be safe?

    already tried teflon tape...
    23" frame...
    beautiful gorgeous gold frame, with lots of miles and memories...

    thanks for any help

  2. #2
    Call me The Breeze I_bRAD's Avatar
    Join Date
    Aug 2006
    Location
    Corbyville Ontario
    My Bikes
    2004 Litespeed Siena, 1996 Litespeed Obed, 1992 Miele (unknown model), 1982 Meile Uno LS.
    Posts
    3,699
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    They can't find a bracket 'cause it's probably french threaded. French threads are very slightly larger diameter than a "standard" british threaded BB and are a finer thread.

    Your options are either to find a french BB (35mmX1mm) or get a BB that screws into itself.

    http://www.sheldonbrown.com/bbsize.html

  3. #3
    Senior Member
    Join Date
    Jul 2005
    Location
    Portland, OR
    My Bikes
    Surly Pacer with full Ultegra
    Posts
    1,016
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I doubt it is french, since the drive side cup on a french bike is screwed in the oposite direction as a british bike. Maybe swiss?

  4. #4
    A little North of Hell
    Join Date
    Mar 2006
    Posts
    4,365
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    might have to go with Italian threading.
    [SIGPIC][/SIGPIC]
    XXXI

  5. #5
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,295
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by I_bRAD View Post
    or get a BB that screws into itself.

    http://www.sheldonbrown.com/bbsize.html
    For exmaple the YST "Threadless" bb, this will save your bike, but the bb is of ultra **** quality. No jokes.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  6. #6
    slow as I ever was Ex Pres's Avatar
    Join Date
    Dec 2007
    Location
    an imposter living in the 35223
    Posts
    5,656
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    My old French frame was retapped Italian and I use a 2mm spacer for the extra width.
    72 special CNC ___________ 72 Frejus (ala Legnano) __73 Holdsworth Record
    78 Raleigh Professional_____ 80 Ranson_____________ 80 unknown French (SS)
    82 Peugeot PXN10_________83 Trek 620 (nee 600)____ 85 Gianni Motta
    85 Trek 560______________88 Guerciotti GLX
    90 Miele Gara_____________02 Casati Dardo (g/blue)__02 Casati Dardo (y/blk)
    03 Casati Dardo___________08 BF IRO (fixed)________10 Vassago Fisticuff (IGH)

  7. #7
    Senior Member Grand Bois's Avatar
    Join Date
    Mar 2005
    Location
    Pinole, CA, USA
    Posts
    15,279
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)
    I think that a late 70's Motobecane will have Swiss BB threads and I'll bet that someone used British cups. A Phil Wood BB and Swiss rings will save it, but figure about $140. You can watch eBay for a set of Swiss cups and maybe get them for $50. Swiss bottom brackets are the rarest of them all. You can find a shop that will retap the shell to Italian size and use an Italian BB with a 2mm spacer. I have no idea what that would cost.

    You have to decide if it's worth it:
    http://cgi.ebay.com/Vintage-Campagno...d=p3286.c0.m14
    Last edited by Grand Bois; 06-12-08 at 08:52 PM.

  8. #8
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,295
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dirtdrop View Post
    I think that a late 70's Motobecane will have Swiss BB threads and I'll bet that someone used British cups. A Phil Wood BB and Swiss rings will save it, but figure about $140. You can watch eBay for a set of Swiss cups and maybe get them for $50. Swiss bottom brackets are the rarest of them all. You can find a shop that will retap the shell to Italian size and use an Italian BB with a 2mm spacer. I have no idea what that would cost.

    You have to decide if it's worth it:
    http://cgi.ebay.com/Vintage-Campagno...d=p3286.c0.m14
    I'd just retap to italian, it couldn't cost more than $50 to do it at your LBS and now you have a world of options in italian bb's.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  9. #9
    Newbie
    Join Date
    Jun 2008
    Posts
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Ill get some estimates and try to have it re tapped at another shop
    thanks for all the help
    ill let you know how it goes

  10. #10
    Newbie
    Join Date
    Jun 2008
    Posts
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    one other thing... will my crank and pedals fit onto an italian bracket? I believe they're stock...
    if not, is there a way to modify them to fit?
    thanks again

  11. #11
    slow as I ever was Ex Pres's Avatar
    Join Date
    Dec 2007
    Location
    an imposter living in the 35223
    Posts
    5,656
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by goldmotobecane View Post
    one other thing... will my crank and pedals fit onto an italian bracket? I believe they're stock...
    if not, is there a way to modify them to fit?
    thanks again
    crank will fit - basically it doesn't care about the BB shell threading. But you will have to find a new BB with the correct spindle length. You'll need to measure the length of the one you have now.
    72 special CNC ___________ 72 Frejus (ala Legnano) __73 Holdsworth Record
    78 Raleigh Professional_____ 80 Ranson_____________ 80 unknown French (SS)
    82 Peugeot PXN10_________83 Trek 620 (nee 600)____ 85 Gianni Motta
    85 Trek 560______________88 Guerciotti GLX
    90 Miele Gara_____________02 Casati Dardo (g/blue)__02 Casati Dardo (y/blk)
    03 Casati Dardo___________08 BF IRO (fixed)________10 Vassago Fisticuff (IGH)

  12. #12
    Senior Member due ruote's Avatar
    Join Date
    Dec 2006
    Posts
    4,303
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dirtdrop View Post
    I think that a late 70's Motobecane will have Swiss BB threads and I'll bet that someone used British cups.

    I don't know about that. My 1979 Team Champion is French threaded. Will the re-threading to Italian work with French threads, or is that just a recommendation based on the assumption that the threads are Swiss?

Posting Permissions

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