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PostPosted: Fri Jan 04, 2013 3:02 pm 
Retro Guru
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Joined: Mon Aug 15, 2011 8:21 pm
Posts: 275
Location: Paignton
I've had this problem since I got my 2012 Cinder Cone:
Shifting the rear gears is no problem, up and down. Only until I reach the two biggest sprockets... Then the chain and derailleur start playing funny.
Clicking the shifter from the smaller sprockets up there is "one click - one shift" smooth work. Then when I get to the second biggest one I can hear and feel the chain wants to go up even more. Like the cable was too tensioned. When I shift right to the top and then one down the problem is noticeably even more - the chain jumps between the two sprockets, trying to stay on the biggest one.

When I loose the cable tension it's a bit better, but then to shift up from any position I need to do a "click and a half" thing. Very annoying, especially when reaching these more technical climbs...

The mech is Shimano SLX, shifter Alivio 9-speed, cassette HG-53. The chain has been replaced regulary (it's the 3rd one now), the cable is fresh too (Shimano XTR). Where is something wrong? :? Is it the shifter's fault?


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PostPosted: Fri Jan 04, 2013 5:21 pm 
Old School Grand Master

Joined: Sun Jun 27, 2010 9:37 am
Posts: 3976
two things spring to mind.

mech hanger may be ever so slightly bent.

or the slx mech is wonky. the one i have is and causes the same problems you are experiencing. i just haven't been arsed to replace it yet :lol:


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PostPosted: Fri Jan 04, 2013 8:28 pm 
Gold Trader / rb Rider / Special
Gold Trader / rb Rider / Special
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Joined: Mon Aug 31, 2009 12:26 am
Posts: 16165
Location: Rurally close.
B tension? Worn cassette? Cable too short/one of the bits of outer too short?

Or as jama says. Do the easy ones first.


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PostPosted: Fri Jan 04, 2013 9:29 pm 
Retro Guru

Joined: Thu Aug 04, 2011 12:38 pm
Posts: 341
Location: antwerp, belgium
Try to loosen the tension screw beneath the mech mounting bolt. Of the mech is to far forward, it wil touch the largest cogs.

Grtz,
Danny


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