Chain of Events
09-02-14 | 02:19 PM
#1
Thread Starter
Senior Member
Joined: Oct 2009
Posts: 1,001
Likes: 6
From: New England
Bikes: Trek 1.1
Chain of Events
Today was the second day in a row that my chain came off. On two different bikes!
Yesterday my Trek and today my vintage Fuji. I wonder if the hot sticky weather is
making me sloppy in my shifting. I know the chains on both bikes are relatively new.
Think it is time for some routine maintenance and perhaps a slight adjustment on
the rear derailleur on the Fuji.
Yesterday my Trek and today my vintage Fuji. I wonder if the hot sticky weather is
making me sloppy in my shifting. I know the chains on both bikes are relatively new.
Think it is time for some routine maintenance and perhaps a slight adjustment on
the rear derailleur on the Fuji.
09-02-14 | 02:42 PM
#2
Senior Member
Joined: Feb 2011
Posts: 4,681
Likes: 253
From: Minnesota
Bikes: N+1=5
Today was the second day in a row that my chain came off. On two different bikes!
Yesterday my Trek and today my vintage Fuji. I wonder if the hot sticky weather is
making me sloppy in my shifting. I know the chains on both bikes are relatively new.
Think it is time for some routine maintenance and perhaps a slight adjustment on
the rear derailleur on the Fuji.
Yesterday my Trek and today my vintage Fuji. I wonder if the hot sticky weather is
making me sloppy in my shifting. I know the chains on both bikes are relatively new.
Think it is time for some routine maintenance and perhaps a slight adjustment on
the rear derailleur on the Fuji.
I don't think the hot weather has anything to do with it. The derailleur limit screws need adjusting.
J.
09-02-14 | 02:58 PM
#3
feros ferio
Joined: Jul 2000
Posts: 22,398
Likes: 1,865
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;
This is also a good time to check your chains for wear and elongation. I use Sheldon's formula -- if 24 half-links measure more than 12-1/16", indicating 0.5 percent elongation, it's time for a new chain.
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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
09-03-14 | 05:13 AM
#4
Let's do a Century
Joined: Oct 2004
Posts: 8,319
Likes: 883
From: North Carolina
Bikes: Cervelo R3 Disc, Pinarello Prince/Campy SR; Cervelo R3/Sram Red; Trek 5900/Duraace, Lynskey GR260 Ultegra
Normally the chain comes off the front....if that's the case it might mean checking the front derailleur. I assume the chain is coming off when shifting from the larger gear to the smaller one and dropping towards the frame?
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09-03-14 | 05:31 AM
#5
Senior Member
Joined: Jul 2004
Posts: 13,358
Likes: 665
From: northern michigan
Bikes: '77 Colnago Super, '76 Fuji The Finest, '88 Cannondale Criterium, '86 Trek 760, '87 Miyata 712
Your bike is talking to you. I hope you didnt dechain at a critical moment. Very strange you had probs with both bikes.
09-03-14 | 06:05 AM
#6
Thread Starter
Senior Member
Joined: Oct 2009
Posts: 1,001
Likes: 6
From: New England
Bikes: Trek 1.1
The Fuji had the chain come off the rear and needs the outer limit moved in a bit to prevent a reoccurrence.
Generally, though I think there is a problem when shifting in too extreme a movement. That is, say the rear smallest gear and shifting to the lower gear in front and vice versa. Think I have never had the problem when shifting the front gears when the rear chain is in the middle. Both bikes are two chain wheel bikes; the older one a 12 speed and the newer one an 18 speed.
09-03-14 | 12:45 PM
#7
Thread Starter
Senior Member
Joined: Oct 2009
Posts: 1,001
Likes: 6
From: New England
Bikes: Trek 1.1
Went out today and had another chain slip off.
This was on the Trek. I had adjusted the Fuji but not the Trek therefore it was
telling me it, too wanted attention. Pesky things, derailleurs, very sensitive to the
slightest neglect, real or imagined. Amazing that they work as well as they do for
as much as they do. Just need a little tenderness from time to time.
This was on the Trek. I had adjusted the Fuji but not the Trek therefore it was
telling me it, too wanted attention. Pesky things, derailleurs, very sensitive to the
slightest neglect, real or imagined. Amazing that they work as well as they do for
as much as they do. Just need a little tenderness from time to time.
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