I shall speculate: I see a chain on the middle ring that stayed stuck to the teeth at the bottom and came back up the backside until it jammed in the derailleur.
Causes: 1. Old gloopy lube could stick to the chainring teeth. 2. A worn tooth might snag the chain (I'm less convinced of this one). 3. I see chain pickup pins on your rings which tells me you may also have crooked teeth (can't see them) on the middle ring to aid shifting..one of those may have caught the chain. 4. It's a 10- or 11-speed chain and a smidge narrow for those rings. Riv claims they're good up to 10 but those Silver cranks were introduced when all Rivs used 8 or 9, they usually work with 10 (not 11) anyway but you may have gotten unlucky today. Solutions: Clean goop off, check for wear, on your next ride check to see if your chain is trying to catch on the bottom run as it passes the ring back to the rear derailleur. On Thursday, September 15, 2022 at 7:43:43 PM UTC-7 Matthew Williams wrote: > My chain jammed in my front derailleur. What happened? > > I wasn’t going fast or slow, I hadn’t shifted gears, and I wasn’t putting > any unusual stress or power on the drivetrain. I was just cruising along a > flat street, gently pedaling, when suddenly my cranks locked and I couldn’t > pedal forward or backward. > > I coasted to a stop and looked down. The chain was fouled and jammed in > the front derailleur, and the rear derailleur was parallel with > the chainstays. I walked my bike home and took photos of the damage. I have > many questions for you experts: > > 1: What caused this? How and why did my chain get jammed in the front > derailleur? > > 2: Does this breakdown have a name? > > 3: Is this something I did or failed to do e.g. bad shifting, lack of > maintenance, is something bent or misaligned, or is it just the inevitable > entropy from mileage and time? > > 4: How do I prevent this from happening? > > 5: How do I fix it and what tools will I need if I’m out on a long ride? > > Photos below. > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/4e8fb49d-1238-44bb-b49a-3f9f2aa68bbcn%40googlegroups.com.
