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  1. #1
    Junior Member
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    Dec 2007
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    Phoenix, Arizona (Ahwatukee)
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    2004 Trek 5200 frame w/ Shim105 components and lots of other mix and match... Sub 18 pounds (for now)... Shooting for sub 15...
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    Using a 70 mm bottom bracket in a 68 mm bb shell...

    Hi, I am very new at this stuff and was wondering if anybody has ever tried to use a 70 mm bottom bracket in a 68 mm bottom bracket shell on the frame... Both are English Threaded... I was thinking it would work out when I bought the Dura-Ace bottom bracket but now I am nervous (frame is arriving soon)... Thanks for any help...
    -Trek 5200, OCLV120 w/ Shim105 components and other assorted pieces... (about 18 lbs. total weight)

  2. #2
    Senior Member Ziemas's Avatar
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    It won't work. Just buy the correct part.

  3. #3
    Junior Member
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    Dec 2007
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    Phoenix, Arizona (Ahwatukee)
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    2004 Trek 5200 frame w/ Shim105 components and lots of other mix and match... Sub 18 pounds (for now)... Shooting for sub 15...
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    Anyone want to trade for a 70mm Dura-Ace bottom bracket?

    I have a 70mm Dura-Ace bottom bracket, Octalink (model 7703), one of the lightest bb's in production (so I hear) and I need a 68mm Octalink bottom bracket (hopefully also the Dura-Ace)... Let me know
    -Trek 5200, OCLV120 w/ Shim105 components and other assorted pieces... (about 18 lbs. total weight)

  4. #4
    The Red Lantern Rev.Chuck's Avatar
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    Apr 2003
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    A 70mm D/A BB is going to be Itialian thread.
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    I am in the woods and I have gone crazy.

  5. #5
    Senior Member
    Join Date
    Aug 2005
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    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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    Quote Originally Posted by Rev.Chuck View Post
    A 70mm D/A BB is going to be Itialian thread.
    Right. I've never heard of a 70 mm English bottom bracket.

    In the very unlikely event it really is both English and 70mm you can get a 2 mm spacer to fill the gap.

    There are 73 mm English threaded bottom brackets but they are intended for MTB use.

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