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#1
03-24-2023, 01:42 PM
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Chain Derailment on lower pulley cage??
Anyone ever have this happen? How? Bit of a head scratcher. DA9100 DI2 rear der w/ Kogel 14t pulley wheel and DA chain. Rode into a bumpy section of road under full power when this happened. Nothing looks bent or cracked and shifted fine, just a bit noisy.
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#2
03-24-2023, 01:51 PM
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Looks like the chain was installed outside of the guide pin on the rear derailleur. It needs to be reinstalled inside of that pin. It's not fully engaged with the lower pulley.
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#3
03-24-2023, 02:06 PM
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yup
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#4
03-24-2023, 02:07 PM
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Quote:
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#5
03-24-2023, 02:23 PM
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Quote:
__________________
http://less-than-epic.blogspot.com/
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#6
03-24-2023, 02:24 PM
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First gen SRAM Rival had that problem on my Serotta... not really horrible but not a good memory either. I don't really ever remember being able to solve it.
It scratched the living daylights out of the cage on that setup, the cage was polished silver IIRC. The whole groupset was falling apart within 2 seasons (except the brakes) so I didn't have to put up with it that long.
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#7
03-24-2023, 04:47 PM
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If the chain was installed correctly, then the cage was designed incorrectly.
Skip the fancy-schmancy aftermarket pulleys and cages; stick with OEM and you won't have a problem.
__________________
http://hubbardpark.blogspot.com/
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#8
03-24-2023, 05:06 PM
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I had this happen on a Campagnolo rear derailleur. Happened mid-ride. A head scratcher for sure. Seemed impossible but there I was on the side of the road disassembling the derailleur cage.
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#9
03-24-2023, 07:17 PM
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Looks like the chain clearly first derailed off the teeth, then wedged itself alongside the pulley tight enough to force the plate outward, releasing the chain.
I've had a couple of bikes come in where, due to frequent cross-chaining from small ring to small cogs, the pulley teeth eventually wore down to where the chain started eating away at the inner cage plate, which had to be replaced along with the lower pulley in both cases. One was a 6800 GS cage and the other was an M772 having an SGS cage. Both riders were older women who I'm supposing either knew of no reason not to cross-chain, or who perhaps didn't hear so well. In this case, unless the teeth of the lower pulley are asymmetrically worn, I don't know what caused the derailment, but aftermarket chain, pulley or especially a larger pulley might be key factors. Perhaps a rock got between the chain and pulley, forcing the chain outward?
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#10
03-25-2023, 06:06 AM
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Quote:
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#11
03-26-2023, 07:24 AM
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The chain is installed wrongly, look closely at your second picture
Quote:
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#12
03-26-2023, 07:28 AM
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Quote:
Quote:
__________________
Chisholm's Custom Wheels Qui Si Parla Campagnolo
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#13
03-26-2023, 04:42 PM
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Here's an exploded diragram to help with the investigation:
https://www.disraeligears.co.uk/site...mber_2017.html
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#14
03-26-2023, 05:10 PM
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Things flex a lot more than we think. If we had high speed footage of our forks when they hit bing bumps it would freak us out.
__________________
please don't take anything I say personally, I am an idiot.
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#15
03-27-2023, 12:53 AM
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Quote:
__________________
Supersix Evo Hi-Mod, Felt F1, Scott Subspeed 20
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