Chain keeps falling off when climbing?

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davehmercer
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Chain keeps falling off when climbing?

Postby davehmercer » Tue Dec 11, 2012 16:34 pm

Just wandering if anyone can shed some light on this rather irritating and frequent occurrence for me?

A few weeks ago I changed my groupset from the Shimano Sora 9 speed that my bike came with, to Campag Centaur 10 speed, now pretty much every time I climb a hill and I am in the lowest gear (Top of cassette 26 tooth, lower ring compact chainset) my chain comes off?

I have set up the gears and they all seem to shift nicely and I don't get any other issues. The only thing I can think is that I havent changed the chainset which is the original FSA one that came on my bike (2010 Bianchi Via Nirone 7)? I have a new cassette (13-26), front and rear Derailleur's, shifters, cables and chain. Could this be the issue?

Any advice would be much appreciated.

Thanks in advance.

Dave

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nicklouse
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Re: Chain keeps falling off when climbing?

Postby nicklouse » Tue Dec 11, 2012 16:43 pm

so how is it comming off?

of the rings or off the cassette?
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davehmercer
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Re: Chain keeps falling off when climbing?

Postby davehmercer » Tue Dec 11, 2012 16:46 pm

Sorry should have said, its coming off of the chainset ring.

:oops:

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Monty Dog
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Re: Chain keeps falling off when climbing?

Postby Monty Dog » Tue Dec 11, 2012 17:03 pm

Check the alignment and set-up of your front mech - the outer cage plate could be too far inboard and pushing the chain off. It may be compounded by a flexing crank/bb i.e. as you push down, it flexes outboard. The inner cage plate only just needs to clear the inside of the chain.
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lc1981
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Re: Chain keeps falling off when climbing?

Postby lc1981 » Tue Dec 11, 2012 17:53 pm

Does it come off as you're shifting gear, or some time after you've shifted into the lowest gear?

freddiegrubb
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Re: Chain keeps falling off when climbing?

Postby freddiegrubb » Tue Dec 11, 2012 21:16 pm

It shouldn't come off but if you can't sort it think about a chain catcher.

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Gizmodo
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Re: Chain keeps falling off when climbing?

Postby Gizmodo » Tue Dec 11, 2012 21:23 pm

If it is falling off the small chainring when you shift down from the large ring whilst under load, do 2 things. Adjust the low stop screw slightly so the front mech doesn't go quite so far in (it may be just a fraction) and don't drop down under load, just back of the power for half a second whilst you change gear. That's what worked for me.

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davehmercer
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Re: Chain keeps falling off when climbing?

Postby davehmercer » Wed Dec 12, 2012 09:26 am

Thanks for the replys chaps,

It doesn't happen when changing down it only seems to happen when peddling up hill without too much pressure on the pedals?

Ill check everything that has been recommended and try again.

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brettjmcc
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Re: Chain keeps falling off when climbing?

Postby brettjmcc » Wed Dec 12, 2012 09:39 am

Double check the chain. I had something similar last year and it turned out that one of the links had slightly bent/mishaped. New chain and it was fixed for me.
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davehmercer
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Re: Chain keeps falling off when climbing?

Postby davehmercer » Wed Dec 12, 2012 10:02 am

brettjmcc wrote:Double check the chain. I had something similar last year and it turned out that one of the links had slightly bent/mishaped. New chain and it was fixed for me.


Ahh, that sounds like it could be the issue as I did make a bit of a hash up of the fitting of the new chain and managed fool up one of the links! Ill pop out and get another chain! :D

Thanks


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