Bicycle Mechanics - Would you trust this chain.

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.
cyclezealot
02-02-04, 07:27 PM
Ironic..I was riding back from the bike shop after putting on a new middle chain ring on my oldest road bike...
Crossing a street in traffic, I shifted very poorly when a downhill grade turned into an hill as going into a shopping mall entrance.
Well, anyway, I had just down shifted and needed to suddenly up shift..I did a very poor job of it.
Upon going up the grade, my chain was really tightly wedged between lower end chainrings.. It was wedged below the dustcaps in the chain rings...Thought I could not get them out..Found a knife. Forced the chain out by prying it upward.Looked at some of the plates..Where the pins come out of ( especially the removable link) the plate, the plate looks like it might be bent.
Would you trust this chain.? ..I had just put it on with the new chain ring... Might the links be damaged.? I usually ride my bike to the bike shop..The closest shop I find trust worthy is 17 miles away.
Since the chain is nearly new, a good compromise between safety and economy is to replace just the (few, I presume) damaged links.
cyclezealot
02-02-04, 11:19 PM
[QUOTE=John E]Since the chain is nearly new, a good compromise between safety and economy is to replace just the (few, I presume) damaged links.[/QUOTE
John..Talked to a cyclist friend about tomorrow's ride.Shared with him how my chain got stuck between two chainrings...I was told chainrings/chains are purposely contructed so that this would be almost impossible...
If not, then surely in the shifting process, it would be a common ocurrence...The spaces between the chainrings must be considerable smaller than the width of the chain..
Makes complete sense...When shifting causes a chain to slip off a ring, the only direction must be either over the small or large ring...So I am told... I am sure it got stuck between the smallest inside and middle ring...I pryed too hard to get it out, to not be sure of that...
I am told if such were possible, shifting would be a very dangerous action..?
That means then that a spacer is either too wide or it is the wrong ring..Anyone had this problem...?thanks....If so, should I ride this bike to the shop...
Retro Grouch
02-03-04, 03:03 PM
Oftentimes chainrings, especially middle chainrings aren't symmetrical from side to side. Are you sure you didn't put it on backward?
cyclezealot
02-03-04, 07:04 PM
Oftentimes chainrings, especially middle chainrings aren't symmetrical from side to side. Are you sure you didn't put it on backward?
Thanks..Retro...A cycling friend stopped by after their ride.. We measured the gap between the two side of the middle ring. It was obvious , even visually, one side was much wider than the other..
Retro, are you a mechanic...This was done at the bike shop... Yes, that seems to be the problem;and chains slipping between rings would be the result?
Thanks..Retro...A cycling friend stopped by after their ride.. We measured the gap between the two side of the middle ring. It was obvious , even visually, one side was much wider than the other..
Retro, are you a mechanic...This was done at the bike shop... Yes, that seems to be the problem;and chains slipping between rings would be the result?
That same thing has happened to me once on my new FSA triple. As you said, the gap between the inner (small) chainring and the middle one seems just big enough to allow the chain to jam in between. I didn't see any pins to prevent this either. Believe I'll measure the gaps, and email FSA about the issue.
Checked the gaps at about 5/32" (4 mm) between both the inner/middle and middle/outer rings, so that's not it.
Thinking more about my jam, believe my problem was operator error....failed to keep up with the tension on the chain while shifting down, which caused slack chain at the top and the folding over. Noticed today that when shifting down to the little ring, I wasn't expecting the big cadence increase. After a few dozen practice shifts now, no problem.
Powered by vBulletin® Version 4.1.12 Copyright © 2012 vBulletin Solutions, Inc. All rights reserved.