Advertise on Bikeforums.net



User Tag List

Results 1 to 11 of 11
  1. #1
    seņor member seaneee's Avatar
    Join Date
    Jun 2006
    Location
    yay area
    My Bikes
    Malvern Path Racer, Schwinn LeTour, Follis, Bridgestone 400 (RIP), concord 2sp
    Posts
    1,157
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Using a 68mm BB in a 70mm shell- Is it possible.

    So I have an older english thread bike, with a weird 70mm BB shell. Would it be possible to use a 68mm bottom braket in it or can I make the italian thread work? Aren't they pretty close?

    thanks.

  2. #2
    Paste Taster Retem's Avatar
    Join Date
    May 2006
    Location
    Denver, Co
    My Bikes
    1970's kobe, Jury Bike, Dahon Boardwalk S1, Moto Outcast 29, Scrambler v3
    Posts
    4,390
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    get phil wood bb cups but the measurement sound italian
    I am dyslexic so bear with my posts.... [SIGPIC][/SIGPIC]

  3. #3
    Senior Member jacobs's Avatar
    Join Date
    Apr 2005
    Location
    Boston, MA
    My Bikes
    http://www.jacobsbicycles.com
    Posts
    787
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Italian BB's are 73mm wide, English are 68mm. The width is arbitrary, as long as you choose the correct spindle length for the purpose. The issue is the threading. If it's Italian an English BB will probably just fall right in, and not engage the threads. It's hard to crossthread an Italian BB with an English cup.

  4. #4
    Senior Member
    Join Date
    Apr 2006
    Posts
    155
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    just use a 70mm italian spindle. you don't need to match up the spindle to cups . . . i asked myself the same question a few years ago. i have a 1954ish holdsworth la quelda that for some reason a 68mm spindle does not work in. i tried, out of curiousity, a 70mm spindle and it worked perfectly. still running it a few years later with no problems.

    also, absolutely you cannot make italian threaded cups work in an english threaded BB.

    and don't worry, i haven't forgotten about that TA chainring. as soon as i get back from visiting my folks i'll check the teeth count and send you a picture.

    also, i have never seen a 73mm italian shell in my life.

  5. #5
    hunter, gatherer coelcanth's Avatar
    Join Date
    Feb 2005
    Posts
    1,183
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    there's a bunch of things you could do..

    -you could mix and match spindles and cups until you find a combo that works..
    -you could use a phil wood bb with no problem (they thread all the way iinto the shell and do not have cups that contact the outer surface of the shell)
    -or you could have a framebuilder or bike shop with bb facing equipment take your shell down 1mm on each side, making it 68mm

  6. #6
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,295
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Or you could just buy the proper bottom bracket.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  7. #7
    seņor member seaneee's Avatar
    Join Date
    Jun 2006
    Location
    yay area
    My Bikes
    Malvern Path Racer, Schwinn LeTour, Follis, Bridgestone 400 (RIP), concord 2sp
    Posts
    1,157
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by operator
    Or you could just buy the proper bottom bracket.

    But THATS the thing. There is not proper bottom braket. It was for cottered, and I'm switching to square taper. 70mm english thread is not a common size, usually 68 english, 70 italian. Which makes your comment a moot point.

  8. #8
    seņor member seaneee's Avatar
    Join Date
    Jun 2006
    Location
    yay area
    My Bikes
    Malvern Path Racer, Schwinn LeTour, Follis, Bridgestone 400 (RIP), concord 2sp
    Posts
    1,157
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    apotnolid, rad thanks. I came across a NOS shimano for $10, thats italian. It's worth a shot. As for the TA chainweels, no problem. I get a bit excited, so sorry for the second PM.

    Everyone else, thanks for the help. Phil is sorta out of the question because of price. This was a $20 bike, that I'm trying to convert to SS for my wife. I'm keeping this on on the cheap. That BB would be worth more than the whole bike when I finished.

  9. #9
    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 jacobs
    Italian BB's are 73mm wide, English are 68mm. The width is arbitrary, as long as you choose the correct spindle length for the purpose. The issue is the threading. If it's Italian an English BB will probably just fall right in, and not engage the threads. It's hard to crossthread an Italian BB with an English cup.
    How is the width of the BB shell arbritrary? There's also 70mm as well.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  10. #10
    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 seaneee
    But THATS the thing. There is not proper bottom braket. It was for cottered, and I'm switching to square taper. 70mm english thread is not a common size, usually 68 english, 70 italian. Which makes your comment a moot point.
    Oh please. If you already know anything what's the point in asking? Which makes your entire thread moot. Go to your LBS and ask them if they can order you a 70mm english BB.

    They exist, they're just not that common. I know this because I bought one for my weird ass bianchi frame which took a 70mm/english.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  11. #11
    seņor member seaneee's Avatar
    Join Date
    Jun 2006
    Location
    yay area
    My Bikes
    Malvern Path Racer, Schwinn LeTour, Follis, Bridgestone 400 (RIP), concord 2sp
    Posts
    1,157
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by operator
    Oh please. If you already know anything what's the point in asking? Which makes your entire thread moot. Go to your LBS and ask them if they can order you a 70mm english BB.

    They exist, they're just not that common. I know this because I bought one for my weird ass bianchi frame which took a 70mm/english.

    Uhhhh, yeah, okay. Thanks for that.

    ANYWAY, I found an old cup an cone BB with a square taper axle. I'm gonna give that one a try since it was free.
    Last edited by seaneee; 12-24-06 at 06:58 PM.

Posting Permissions

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