A bit of context, I was just about 300m away from home so decided to put a little bit of power down, all of a sudden my chain dropped (105 Di2, 12spd) and wrapped around my crank. The chain was wedged between the outer ring and the crank arm with this unidentified object causing the chain to stick between the two. I have washed and checked every single mm of my bike to no avail as to where this piece of metal may have come from. Can anybody identify it as a bike part or is it just bad luck that this piece caused the chain to drop and subsequently wedge itself.
by KingPrawnKorma
9 Comments
Talking out my ass here. Are any pins missing from your chain?
Yeah I know exactly what this is, same thing happened to me. It’s an apple.
https://softsolder.com/2022/09/09/tour-easy-chain-drop-pin/
Looks like a “lifting pin” from the chain ring. Check out this post:
https://www.reddit.com/r/bikewrench/s/7t5oOxJQJQ
Looks like the pin that prevents the chain from getting stuck between crankarm and the chainring if the chain drops to the outside. Is the pin on your large chainring in place?
[The pin in question](https://imgur.com/a/hK28obK)
Do you have any external cable housing on your frame? This kinda looks like a feral.
My eyes can’t tell whether that’s a really small pin, or a giant apple.
An apple for scale?
It’s pressed to the inside of the big ring to keep the chain from dropping between rings.