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What is it and where does it fit? (C-clip? Stop ring?)

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What is it and where does it fit? (C-clip? Stop ring?)

Old 05-06-18, 05:51 AM
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[Solved] What is it and where does it fit? (C-clip? Stop ring?)

I was attempting to lock a chain connector (Powerlink) when I accidentally let the chain go, and some parts ended up on the floor
There is one part that I've never seen before and have no idea where it fits:

It is about 7mm in external diameter, and the internal diameter is exactly the same as a chain pin.
The chain is a KMC x11, both derailleurs are Shimano 105 5800.
There was quite a bit of force involved, as the chain rollers from both ends of the chain fell to the floor.

It doesn't seem to fit with the chain (where?!), and Shimano 105 5800 derailleur manuals don't mention it either:

Any ideas where it belongs?


Alright, problem solved. It turned out it's a stop ring for TRP HY/RD disc brakes. The stop ring was loose, as I can now see on detailed photos of my bike from the day I bought it.
Here's a photo showing where it fits, perhaps someone will find it useful.

Mods, feel free to close this thread. Sorry for spamming, but I was trying to solve it already for 2 hours when I posted...

Last edited by RadS; 05-06-18 at 06:36 AM. Reason: Solved
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Old 05-07-18, 07:12 AM
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Its a huge close up , how big is it, really?..measure.
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