Rear cog issue

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Rear cog issue

Postby Ferrals » Tue May 13, 2014 20:55 pm

I'm going to take the bike to a shop tomorrow anyway but would be interested to hear opinions on this in case it's something I can easily fix myself:

2 by 10 drivetrain, SRAM i think x7 rear mech. On the fourth cog up on one of the teeth hits the chain link as the chain is coming off the rear derailleur, so the chain get caught momentarily before slipping into place. This causes a tick to the rear deraileur which I can feel through the pedals. I'm guessing it's no good for any part of the drivetrain. It only seems to happen when the chain is on the bigger front ring.

Any thoughts why this is happening? I guess it's either the rear mech or that that specific cog is slightly out of line?

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nicklouse
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Re: Rear cog issue

Postby nicklouse » Tue May 13, 2014 21:15 pm

Chain needs looking at.

Cassette needs looking at.


Stiff link (incorrectly fitted chain) or bent tooth.
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Re: Rear cog issue

Postby Ferrals » Tue May 13, 2014 21:24 pm

Thanks. Will take it to the shop in the morning.

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Re: Rear cog issue

Postby cooldad » Tue May 13, 2014 21:42 pm

Or just look - you know which cog, look for a bent or misformed tooth.

The chain you can just feel, or pedal slowly upside down - you'll see if a link is stiff - it will 'blip'.
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Re: Rear cog issue

Postby BigAl » Tue May 13, 2014 22:40 pm

Would expect a stiff link to be apparent on all sprockets (or at least all the smaller ones)

As said above, you know which sprocket - check for a bent or damaged tooth.

LBS will, most likely, recommend a new cassette - which (unless cassette & chain are almost new) will mean a new chain too

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Re: Rear cog issue

Postby Ferrals » Wed May 14, 2014 05:24 am

Cheers, if a cog is bent/ damaged what do I do? Try and straighten it with a pair of pliers? Bike is only 3months old so hopefully can just replace what needs changing, if anything, rather than both

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Re: Rear cog issue

Postby Chunkers1980 » Wed May 14, 2014 06:33 am

Worry about that when it happens

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Re: Rear cog issue

Postby Ferrals » Wed May 14, 2014 07:14 am

hmm chain seems supple and nothing obvious wrong with the cogs. will take to the shop. i'm not the most mechanically minded though


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