Clarifying: I don't actually know what chain you're using, I'm just 
wondering if you have a 10- or 11-speed chain on those 7/8/9-ish rings. A 
10 should work but you could get unlucky, an 11 probably won't. 

On Thursday, September 15, 2022 at 9:01:56 PM UTC-7 Joe Bernard wrote:

> 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.
>>
>>

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