Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    Senior Member askrom's Avatar
    Join Date
    Jul 2005
    Posts
    205
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My frame is a 1989 Olmo, so I figured the BB threading might be Italian. So I measured the BB and it came out to 68mm, not 70mm which is the Italian standard. Everything I've read says that 68mm is English threading and that 70mm is Italian. So when I got a new BB, I got it with English threading. Now I've removed the old BB, and as I try to insert the new BB, it doesn't fit. The English BB is too small. Oops, I'm Italian! Damn.

    I guess I didn't want to bother removing my old BB to check the thread direction (clockwise/counterclockwise) after having confirmed the very clear 68mm width. I should have, though, because yes, I did remove both cups with the same counter-clockwise rotation. That's not English threading, apparently.

    I've checked Sheldon Brown's charts, and re-checked them today.
    http://sheldonbrown.com/gloss_bo-z.html#bottom

    So my questions are twofold, both regarding my 68mm bottom bracket shell measurement.
    1) Is it likely that my threading is Italian, as I now assume it is, or could it be something entirely different?
    2) Will a "normal" 70mm Italian BB work in my 68mm shell? Do I need like a pair of 1mm spacers or something?

    Thanks!

    PS: I think I'm doubly screwed here. My new crank is a Truvative Roleur, which has an integrated BB spindle on the drive side. So to replace the BB, I'd somehow need to find just the cups to fit my frame. Yt I've only ever seen the crank sold with the BB included. Can I buy just the BB parts for a crank with an integrated BB? Where would I go for such stuff?
    Last edited by askrom; 10-20-05 at 07:39 AM.

  2. #2
    Senior Member sydney's Avatar
    Join Date
    Jan 2004
    Posts
    9,428
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Consider the shell might have been faced a few times, or off spec in the width to begin with. The 70mm shell width is not engraved in titanium. It's the thread diameter,pitch and direction that matters. The Italian BB you got will work. I've even used 68mm BB in 73mm english shells.

  3. #3
    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)
    To get the cups first try the company you got the crankset from. If that does not work try Truvativ. They are owned by Sram. www.sram.com

  4. #4
    Senior Member askrom's Avatar
    Join Date
    Jul 2005
    Posts
    205
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I got it off ebay. Still, I think I've found a couple of places that sell the cups separately. Thanks!!

  5. #5
    feros ferio John E's Avatar
    Join Date
    Jul 2000
    Location
    www.ci.encinitas.ca.us
    My Bikes
    1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
    Posts
    14,949
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    That's the first time I have ever heard of 36x24 cups with a 68mm BB shell width, but there is no reason except tradition that it couldn't be done that way.

    Thanks for blowing my standard advice to measure BB shell width to identify Italian BBs.
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
    Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
    Peugeot: 1970 UO-8, S/N 0010468
    Bianchi: 1981 Campione d'Italia, S/N 1.M9914
    Schwinn: 1988 Project KOM-10, S/N F804069

Posting Permissions

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