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PostPosted: Sun Apr 21, 2013 2:18 pm 
retrobike rider
retrobike rider
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Joined: Thu Mar 17, 2011 3:53 pm
Posts: 871
Location: London
I'm running my Torus as 1X8 using a Middleburn UNO and the chain keeps coming off the front ring. Any ideas why. It wasn't doing it last week.

Thanks,
Matt


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PostPosted: Sun Apr 21, 2013 2:58 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Sat Jul 21, 2007 9:48 am
Posts: 6974
Location: Bristle
inside or outside?


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PostPosted: Sun Apr 21, 2013 2:59 pm 
retrobike rider
retrobike rider
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Joined: Sun Feb 19, 2012 10:08 am
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Location: Nth Somerset, UK
Could be the crank has become very slightly loose, or the bottom bracket.

If it was OK before, then something must have changed.


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PostPosted: Sun Apr 21, 2013 3:14 pm 
retrobike rider
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Joined: Thu Mar 17, 2011 3:53 pm
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Location: London
Cranks and BB both seem solid.

Chain stays on when rotating the cranks forward or when rotating the wheel backwards, but if I spin the cranks backwards the chain jams between the cassette and the top jockey wheel and then when I spin the crank forwards again it drops the chain on the inside.


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PostPosted: Sun Apr 21, 2013 4:19 pm 
Retro Guru
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Joined: Sat Apr 02, 2011 11:16 am
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Location: Camden, London
I'd check to see if any stiff links, bit of something stuck in links maybe ? give chain a good clean ?


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PostPosted: Sun Apr 21, 2013 8:07 pm 
Old School Grand Master
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Joined: Fri May 01, 2009 7:11 pm
Posts: 8479
Location: Fircombe.
No components have been changed?
Bent tooth, front or rear?
twisted chain, broken link?
Bent mech/ hanger?
Double check the crank/BB tightness, with the appropriate tools.


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PostPosted: Sun Apr 21, 2013 9:12 pm 
retrobike rider
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Joined: Thu Mar 17, 2011 3:53 pm
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Location: London
Thanks for the input everyone. Turned out the lower jockey wheel was sticking. Probably the last bit of authentic Cotswolds mud from the HONC. :shock:

And I've cleaned it twice since last Sunday. :oops:

Now as smooth as a baby's bum. :D


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