dropped chain caught in fixed gear cog

[spiderman]

anyone have that happen to them...??
...i've dropped the chain off my fixed bike before
but today it seemed like even though it flopped
as i went over a speed bump/curb
it was still on...
so i continued to pedal.
the chain got stuck between the cog and the spokes
and the wheel suddenly stopped spinning
and i came to skidding stop.
it was all i could do to get the chain pulled out
and back on track.
maybe it's time for a new chain...
...it has been a year now come to think of it...

[Grant McLean]

sounds like a case of the chain needing some love and a tug.

g

[spiderman]

it was certainly displaying
serious attention seeking behavior!
...and seems very happy now...

[Smiley]

happened to me and I was decending at over 28 mph , locked up and skidded , tightened chain and rode home . The chain was jammed pretty good between the spokes and the rear cog though.

[bironi]

Sounds scary. Do you normally ride with a tight chain, or with a bit of slack?

[11.4]

This could be caused by any of the following (or more than one):

1. With everything tightened up and ready to ride, you should have about an inch or a tad less of up-and-down movement in the midpoint of the chain. Much more, and the chain can flip off.
2. Chainline misalignment between the cog and the chainring.
3. Excessive wear on either the cog or the chainring, or of the chain itself.
4. Using a 3/32" chain. A 1/8" chain is much stiffer side to side and resists derailing much more effectively.
5. A damaged chain link -- all it takes is one link that wants to ride up on the chainring or cog and flip off. However, this usually takes extra chain slack to derail the chain rather than simply snap it.

You're lucky you stayed up, and that the derailing happened on the rear cog. If it happened on the front, the rear would wrap the chain around the frame and either cause you to lose complete control or cause significant damage to your frame. It simply shouldn't happen, and it's important to figure out why it did.

[Marron]

I've never dropped a chain on my various fixed gears but I have lost at least two white cotton handkerchiefs. I carry them to clear my frequently runny nose and its pretty funny when you drop one and it gets immediately destroyed in the drivetrain.

[William]

http://www.bicyclesouth.com/images/chainJamWheel.jpg

http://www.utahmountainbiking.com/fix/pics/b-clean1.jpg

http://k47.pbase.com/o2/28/527328/1/52416049.yapacani11150513978.jpg

http://www.schenie.de/bilder_mit_schenie/17052003_haldenwang_img13.jpg

http://www.diesel-ebooks.com/mas_assets/thumb/parent-0977711226.jpg

[spiderman]

((This could be caused by any of the following (or more than one):

1. With everything tightened up and ready to ride, you should have about an inch or a tad less of up-and-down movement in the midpoint of the chain. Much more, and the chain can flip off. ))


...i have too much slack in my chain...
i'll take out a link before i ride again!
thanks.
i've been thinking it was too slack
and that's a great test to prove it.
i really appreciate the tips
and the great pics...wow!!