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Chain fell off - Random Event?(7 posts)

Chain fell off - Random Event?NewDayNewWay
Nov 23, 2002 4:19 PM
I switched to my big chain ring today on a ride and my chain fell to the inside. I thought I was out of the group ride, but I managed to spin the crank a few times and get the chain back on (a trick that I think I saw in a post on this board). Anyways, the shifting was fine after that. I'm going to put it in my stand and check it out, but before I tinker, I was wondering if this sort of thing can just happen due to random circumstances (e.g., the sun coming out from behind a cloud when you push down on the crank), or if this actually means that an adjustment needs to be made. If I tinker and nothing is wrong, then I risk making things potentially even worse (creating, what I affectionally term, "a learning experience" when I have even more shifting problems as a result of my tinkering).
More data please.Scot_Gore
Nov 23, 2002 5:36 PM
NDNW,

Couple of questions:
1) Were you accelerating hard at the moment of shift?
2) How cross chained were you ? a little, alot, not at all.

In any event, if you couldn't repeat the problem, I'd leave it alone.

my 2 cents

Scot
More data please.NewDayNewWay
Nov 24, 2002 6:58 AM
No, I don't believe I was accelerating.

(and actually, a correction to my post. The chain fell to the OUTSIDE, not the inside.)

Not sure if I was cross-chained or not.

I've had my bike in the stand and the shifting seemed fine, not to mention the fact that I didn't have any problems for the rest of the ride. I'm going to leave it alone.

I have not adjusted the front derailleur on my road bike, so let me make sure I've got this right should I need to adjust it (I've done this plenty of time on my MTB). On my ultegra, I don't seen an H or L on my front derailleur, but it looks like the OUTSIDE screw controls the outside limit of the front derailleur and the INSIDE screw controls the inside limit of the front derailleur (I think this is the reverse of my MTB, which is a top-pull versus my bottom-pull ultegra, if that has anything to do with it). Correct?
I concur, call it a fluke. Look on the back of your front DR for "L" & "H"Scot_Gore
Nov 24, 2002 7:14 AM
ooohhh, six hours of Park class and I'm a dangerous man : )
I concur, call it a fluke. Look on the back of your front DR for "L" & "H"NewDayNewWay
Nov 24, 2002 3:38 PM
I used a flashlight to try and find the H and the L but I still don't see it! I looked on top, on the bottom, and on the side. I even squinted and crossed my eyes in case the lettering is microscopic, but I just don't see it anywhere!
Here's the trickKerry
Nov 24, 2002 6:14 PM
Shift to the big ring and see where the derailleur sits - you'll probably see it is farther out over the big ring than it needs to be. You likely should adjust your upper limit screw. When the derailleur is all the way out, try turning the two screws "in". The one that puts up a fight is your upper limit. Shift to the small chainring and turn that one in a half turn. Shift back to the big ring and see how things work. Repeat the process until the shift to the big ring gets difficult, and then back the upper limit screw out a half turn. As a final check, shift to the big ring/small cog and make sure the chain is not rubbing the outer FD cage.
Here's the trickDINOSAUR
Nov 25, 2002 3:31 PM
It's probably the upper limit screw on the front der as Kerry has already lined out. When I start making adjustment with my deraileurrs I do them under load and stop and make a couple of quick adjustments while I'm riding. For some reason everything works great in my garage but when I start riding things need little tweaks here and there. Take a spin around the block and take a couple of hex wrenches with you. You might have to stop 4 or 5 time to get everything right..