HELP! BB/crank just locked up?!?!
01-03-12 | 09:17 AM
#1
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From: Arkansas
Bikes: '81 Fuji Royale/ '96 Rockhopper
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?
01-03-12 | 10:03 AM
#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
01-03-12 | 11:18 AM
#3
Dolce far niente
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From: Southwest Idaho
Or maybe a cup has backed out and tightened up against the back of the crank arm.
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"Love is not the dying moan of a distant violin, it’s the triumphant twang of a bedspring."
S. J. Perelman
01-03-12 | 07:37 PM
#5
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From: Thunder Bay, Ontario, Canada - burrrrr!
Bikes: 1958 Rabeneick 120D, 1968 Legnano Gran Premio, 196? Torpado Professional, 2000 Marinoni Piuma
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.
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01-03-12 | 09:08 PM
#6
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From: St Louis
Bikes: 72 Lygie (SS conv), 87 Ironman Expert, 94 Allez Sport, 16 Black Mountain Cycles Monstercross
01-03-12 | 10:49 PM
#7
feros ferio
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From: www.ci.encinitas.ca.us
Bikes: 1959 Capo Modell Campagnolo; 1960 Capo Sieger (2); 1962 Carlton Franco Suisse; 1970 Peugeot UO-8; 1982 Bianchi Campione d'Italia; 1988 Schwinn Project KOM-10;
If the lockring is loose, epicyclic action will cause the adjustable cup to self-tighten.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
01-04-12 | 08:41 AM
#9
01-04-12 | 11:30 AM
#12
Dolce far niente
Joined: Dec 2004
Posts: 10,710
Likes: 33
From: Southwest Idaho
What do I win?
__________________
"Love is not the dying moan of a distant violin, it’s the triumphant twang of a bedspring."
S. J. Perelman
"Love is not the dying moan of a distant violin, it’s the triumphant twang of a bedspring."
S. J. Perelman
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