Hi,
It appears the front derailleur was positioned too high. Your chain rings look
okay.
When the derailleur is in the middle spot, the bottom of the outer cage should
be about 1/16” (1.9mm) above the tips of the big chainring.
Also, you have a lot of chain to get it wrapped up like that. I thin
I should add:
1: I don’t know if the front derailleur was loose or misaligned prior to the
chain snarl. I’m wondering if the chain kink and the buildup of lube caused it
to bind up. I was pedaling—but not hard—so when the chain hit the front
derailleur, it knocked the derailleur loose and out o
This makes more sense! I had a feeling 500 miles was a typo.
As for how to solve it on the road, a friend had this problem a couple
years ago. She texted me about what to do (this was when she was still
learning bike mechanics, she knows more than me now) and before I could
think of something
4500 miles does sound like that's enough to wear out a chain. You must have
gotten lucky if it didn't wear out the sprockets and chainrings if you were
riding a worn out chain for any length of time. A chain that's been
elongated from wear can definitely wrap around the derailleur and get bent
all
