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  1. #1
    Senior Member Drummerboy1975's Avatar
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    HELP! BB/crank just locked up?!?!

    My buddy has 1988 Trek 1000. The other day we were out on a ride and all of a sudden it was like someone applied both brakes. He could barley pedel. The crank will not turn by hand but will turn if forced with your feet. What might have caused this? We haven't torn into it yet but I'm thinking its the bearings in the BB?

  2. #2
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    It probably has caged bearings, and a piece of the cage cracked off and wedged itself between the balls and the races. The cages are usually softer metal, so hopefully the races have not been messed up. I used to see this all the time when I was a shop monkey back in the 80's

  3. #3
    Dolce far niente bigbossman's Avatar
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    Or maybe a cup has backed out and tightened up against the back of the crank arm.
    "Love is not the dying moan of a distant violin, itís the triumphant twang of a bedspring."

    S. J. Perelman

  4. #4
    )) <> (( illwafer's Avatar
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    my guess is the freewheel is done.

    remove the chain and see.

  5. #5
    Senior Member randyjawa's Avatar
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    Cracked ball or busted cage, would be my first thoughts, if it is indeed the bottom bracket. I have my doubts that the freewheel would be the culprit, but dropping the chain off the the crank rings would be the first place to start your trouble shooting efforts.
    Learn how to find, restore and maintain vintage road bicycles at... MY "TEN SPEEDS"

  6. #6
    Senior Member acoffin's Avatar
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    Quote Originally Posted by illwafer View Post
    my guess is the freewheel is done.

    remove the chain and see.
    The freewheel would have probably thrown the chain. Most likely is bearings or cage.

  7. #7
    feros ferio John E's Avatar
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    If the lockring is loose, epicyclic action will cause the adjustable cup to self-tighten.
    "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
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  8. #8
    Senior Member Drummerboy1975's Avatar
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    He txed me a photo last night at home. It looks as though the cage in the non-drive side has backed out. I'll see for myself today.

  9. #9
    Senior Member Grand Bois's Avatar
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    Quote Originally Posted by Drummerboy1975 View Post
    He txed me a photo last night at home. It looks as though the cage in the non-drive side has backed out. I'll see for myself today.
    I'm trying to make sense of that.

  10. #10
    Senior Member Drummerboy1975's Avatar
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    Ok, here's the deal. His non-drive side bearing cup backed out and is cracked as well.

  11. #11
    Riding like its 1990 thenomad's Avatar
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    time to get a new BB, and check the BB shell on the frame to see if its cracked.
    My blog about rides, bikes and builds: ridesgoneby.blogspot.com

  12. #12
    Dolce far niente bigbossman's Avatar
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    Quote Originally Posted by bigbossman View Post
    Or maybe a cup has backed out and tightened up against the back of the crank arm.
    Quote Originally Posted by Drummerboy1975 View Post
    Ok, here's the deal. His non-drive side bearing cup backed out and is cracked as well.

    What do I win?





    "Love is not the dying moan of a distant violin, itís the triumphant twang of a bedspring."

    S. J. Perelman

  13. #13
    Senior Member Drummerboy1975's Avatar
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    Quote Originally Posted by bigbossman View Post
    What do I win?




    A free life time supply of condements from Burger King. Just tell them I sent you.

  14. #14
    Velophile Epicus07's Avatar
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    Lol
    2009 Specialized Roubaix - Long Distance Bike
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    1996 Litespeed Natchez - Titanium Speed Demon (pics to come)

  15. #15
    Senior Member haddawad's Avatar
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    You can pack the bearing of the new BB with the mayo

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