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Gearing Issue. Help.

Old 08-14-08, 03:06 PM
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FixdGearHead
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Gearing Issue. Help.

Need some help. I've got my road bike set up with gearing for the Mt Washington hillclimb race this Saturday.

22T front chainring, mtb rear derailleur, 11x34 cassette. Had the bike shop install it.

Gears seem to run just fine when it's in the work stand, the RD shifting appropriately all the way to the largest cog. HOWEVER, when out on the road, each time I attempt to run in the 26 tooth cog (third largest), the chain snaps and starts dancing between the 26t cog and the next smallest.

Index shifting problem? cable too loose in that 26t cog?
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Old 08-14-08, 03:14 PM
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G piny parnas
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what kind of index-old shimano thumbs or sti--- check the casings and berols
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Old 08-14-08, 03:23 PM
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FixdGearHead
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Road Ultegra 9-spd shifters and a Shimano XT rear derailleur...
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Old 08-14-08, 03:38 PM
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tommy gayle
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sounds like you cable has slack in it since you changed the other stuff put a new cable on it
hey it only $4 cheep repair then readjust to see if that take care of it I know it did on mine
good luck on the climb
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Old 08-14-08, 04:20 PM
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Whenever I encounter a shifting problem that doesn't respond to regular tuneing procedures, the first thing that I do is to check the derailleur hanger alignment. Most of the time that fixes it.

I've encountered similar problems that were corrected with some very minor hanger tweaking. 9 and 10 speeds are too touchy to eyeball. You need to use the proper tool.
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Old 08-14-08, 08:13 PM
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Try a 1/2 turn counter-clockwise on the barrel adjuster, rear derailleur.
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