Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    Roadie Lyk2Byk's Avatar
    Join Date
    Dec 2007
    Location
    Orange Park , FL
    My Bikes
    LiteSpeed GhisalloTrek 5000, Gary Fisher Kaitai
    Posts
    8
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Dura Ace 7800 Hollowtech BB Bearing Specs

    I need the Bearing specs for the BB in my Dura Ace 7800 Hollowtech
    Lyk2Byk

    Regarding training "It doesn't get easier you just go Faster".

  2. #2
    Senior Member
    Join Date
    Jun 2007
    Location
    The Only Village in the World So Named
    My Bikes
    Mid '70s Cuevas, '91 Greg Lemond Maillot Jaune
    Posts
    136
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hollowtech II bottom brackets don't have replaceable bearings. Once they're bad, you replace the bottom bracket "cups." Here's Shimano's website about it and here are the instructions.
    Quote Originally Posted by marengo View Post
    And I thought Trek was the Trek of bicycles

  3. #3
    Senior Member DannoXYZ's Avatar
    Join Date
    Jul 2005
    Location
    Saratoga, CA
    Posts
    11,495
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yeah, I don't see any way to remove the old bearings without destroying the cups.

  4. #4
    I have senior moments... bikinfool's Avatar
    Join Date
    Oct 2008
    Location
    Woodside, CA
    My Bikes
    Many
    Posts
    2,153
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The bearings can be serviced or replaced. Phil Wood and enduroforkseals.com are both sources for bearings if you want to reuse the cups. enduroforkseals.com sells a tool for the purpose (Phil might too, not sure) but there are other ways to pull and reinstall the bearings. Depends on how much you want to spend in time and $. If you're interested in the procedure there's a sticky at the top of the drivetrain forum on mtbr covering servicing the bearings, replacing them, etc...
    suum quique
    Mountain bikes: Santa Cruz Hecklers (99, 02, 07), Santa Cruz Nomad, Moots YBB, Trek OCLV Pro Issue, American Breezer
    Road bikes: TST, Trek 2300 (Carbon/Alum)

  5. #5
    Roadie Lyk2Byk's Avatar
    Join Date
    Dec 2007
    Location
    Orange Park , FL
    My Bikes
    LiteSpeed GhisalloTrek 5000, Gary Fisher Kaitai
    Posts
    8
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thank you for all your suggestions. I was however attempting to comfirm the dimenions of the bearings. I have since done that and am aware of the Phil tool. I have replaced bearings in other BB using it. Again thank you for your help.
    Lyk2Byk

    Regarding training "It doesn't get easier you just go Faster".

Posting Permissions

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