Chain jamming - rear mech...

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hopper1
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Chain jamming - rear mech...

Postby hopper1 » Thu Nov 08, 2012 17:24 pm

Just installed a new medium cage XT rear mech and a XT 2 x 10 chainset.
All seemed to go easily enough, but the chain occasionally jams as I shift to the 11t sprocket.
Also fitted a new KMC EL 10 speed chain, too.
Just seems that the cage moves down too quickly and the chain hasn't quite left the 12t sprocket, so buckles and jams!
This has only happened on the bike stand so far, so no damage caused, but I guess it could get bloody expensive out on the trail, with some effort through the pedals!
Is it just down to the new 'sticky' chain, or have I missed something fundamental on the installation. There isn't very much room between the XT mech (where it connects to hanger) and the 11t cog. :?
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EH_Rob
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Re: Chain jamming - rear mech...

Postby EH_Rob » Thu Nov 08, 2012 17:26 pm

b screw adjustment perhaps?

Chunkers1980
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Re: Chain jamming - rear mech...

Postby Chunkers1980 » Thu Nov 08, 2012 17:26 pm

Sounds like poor adjustment. Start again.

Are you sure your hanger is straight?

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hopper1
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Re: Chain jamming - rear mech...

Postby hopper1 » Thu Nov 08, 2012 17:47 pm

No issues with the previous XT mech (long cage).
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The Rookie
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Re: Chain jamming - rear mech...

Postby The Rookie » Thu Nov 08, 2012 17:57 pm

low stop not set right allowing it to overshift past the 11T? Also it may shift faster and not lifting off the teeth on the 12T it's meant to and therefor snagging.

B-screw as stated.

It MUST be specific to your bike or setup, it's not like everyone with an XT med' has the problem!

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cooldad
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Re: Chain jamming - rear mech...

Postby cooldad » Thu Nov 08, 2012 19:00 pm

Chunkers1980 wrote:Sounds like poor adjustment. Start again.

This
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hopper1
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Re: Chain jamming - rear mech...

Postby hopper1 » Thu Nov 08, 2012 19:33 pm

Doh!... It was a fundamental error... I didn't hold onto the mech when I tightened the bolt to the hanger, so it moved clockwise, hence the close proximity of 11t cog to the mech!
Never had that happen before... :oops:
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