mystery front shifting problem

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yadn
Posts: 9
Joined: Mon Oct 28, 2013 12:29 pm

mystery front shifting problem

Postby yadn » Wed Nov 06, 2013 16:46 pm

hey all

I recently took off my cranks to clean and grease the bearings on my hollowtech 2 bb

everything fine and dandy until 10 miles into first ride when the chain stopped shifting onto small chainring - even with all tension let out the cable and the limit screw all the way out.

as far as I can see the bearings, axle and preload cap are all fine, without too much wear and properly installed.

cannot figure out what is going on

anyone ever had a similar problem?

cheers

diamonddog
Posts: 2241
Joined: Tue Jun 18, 2013 10:48 am

Re: mystery front shifting problem

Postby diamonddog » Wed Nov 06, 2013 16:49 pm

Is derailleur moving freely or is it sticking possibly?
I had this on my turbo bike and it was the derailleur that was gunged up and not moving freely.

yadn
Posts: 9
Joined: Mon Oct 28, 2013 12:29 pm

Re: mystery front shifting problem

Postby yadn » Wed Nov 06, 2013 19:24 pm

the derailleur seems to be moving fine. I've given it a clean down and bit of lube - I think it's reached the limit of how far it can move into the frame.

JayKosta
Posts: 634
Joined: Sat Mar 02, 2013 15:32 pm

Re: mystery front shifting problem

Postby JayKosta » Wed Nov 06, 2013 20:35 pm

Perhaps a piece of 'gunk' has gotten between the tip of the limit screw and the 'swing arm'.
Or maybe something is wedged elsewhere that is preventing the cage from moving more inward.

Jay Kosta
Endwell NY USA

mattv
Posts: 979
Joined: Mon Apr 03, 2006 20:04 pm

Re: mystery front shifting problem

Postby mattv » Wed Nov 06, 2013 20:46 pm

Or the front mech has been knocked or twisted?

yadn
Posts: 9
Joined: Mon Oct 28, 2013 12:29 pm

Re: mystery front shifting problem

Postby yadn » Wed Nov 06, 2013 21:30 pm

cheers for the suggestions so far...

I'll take the mech off the frame tomorrow and have a close look at it.


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