Question about Shimano Deore Xt Thumb Shifters 7 Spd.mountain Bike

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Moves to a smaller rear cog by it self

Under load the rear derailer will shift to a smaller cog. are the thumbshifters worn?

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Possibly the right one, but I doubt it.

Load-induced upshifting is usually due to the indexing adjustment being off due to normal expected cable stretch over time.

You might need to adjust the tension of the rear derailleur cable. Get a bead on how the gear selected and the two derailleur pulleys line up as viewed from directly behind. They should all be in the same vertical plane. If the pulleys are slightly outboard of the selected gear you can expect random upshifting to the next highre gear (smaller cog).

Turn the barrel adjuster at the derailleur about 1/4 turn CCW as viewed from behind the bike. This will make the cable a small bit tighter and you should see the pulleys move inboard to be better aligned with the selected cog. Try riding it and see if it gets a little better, then try another 1/4 turn. Don't go overboard with it though.

Posted on Feb 01, 2010

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1 Answer

Shimano Derailer 200GS needs adjusting How do I do that?


There is a barrel adjuster on the derailer, right where the cable comes in.

If you are having trouble getting to the easier gears then you need to tighten (usual problem -cable stretches). Pull out the barrel adjuster and unscrew it (turn CCW). Do this gradually until you get the shifting you want.

There are also two little adjusting screws on the face of the derailer that limit the travel of the derailer(keep it from jumping off the cogs, into the spokes or outside it). It is good to check these while you are working on it. The upper one is usually for the easiest gears, screw it in until you can no longer shift to the easiest, then unscrew it just a bit so that you can get in gear, but so the erailer can never go too far). If nothing happened, it is the other screw, so tighten that one.

Now do the other screw, tighten it until you can no longer shift to the smallest cog , then unscrew a bit, making sure you can shift to the smallest cog.

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Cannot get rear derailer to work properly 24 inch girls evolution


Don't start messing with the derailleur yet! Make sure your shifting trouble isn't due to something else, such as a warped, dirty, or stretched chain, gummed-up pulleys, crud in the cable housing, trapped cable, or a bent derailleur hanger
Clean the chain and the rear derailleur pulleys. Pull the chain away from each pulley, and turn the pulley to make sure it can move freely. A pulley that offers resistance to turning must be replaced.
Now check the cable to be sure it slides freely. Mud and grit within the cable housing, or on a cable-guide, can keep the derailleur from moving a "full gear" during downshifts. If the cable doesn't slide freely in the housing, you may be able to clean or lube it to restore smooth shifting.
Let the high-gear limit screw. In your highest gear on the shifter, and with the chain on the smallest cog, position the derailleur so the upper pulley exactly matches the teeth of the small cog. Run the chain a bit with the front derailleur in the large ring, adjusting the limit screw until the pulley and the cog seem to match perfectly.

Setting the high-gear (small cog) limiting screw.



Once you're sure the derailleur matches the cog, move it just a whisker (1/8 to 1/4 turn) towards the other cogs. (You may need to readjust a bit if you get chain-skip.)

Closeup of setting the limiting screw.



Now adjust the low-gear limit screw. Shift into the lowest gear (largest cog). If it won't go, loosen the limit screw. With the chain on the largest cog (and the front derailleur in the small chainring), adjust the derailleur so the upper pulley exactly matches the teeth of the large cog.Once it's perfect, turn the limit screw so it moves the derailleur a tiny amount towards the other cogs (1/8 to 1/4 turn usually works).

Setting the low-gear (largest cog) limiting screw.



Now shift to the highest gear (smallest cog). Push the shift lever to downshift one gear (go from the smallest cog to the next-smallest). If it doesn't shift, tighten the cable with the barrel adjuster, 1/2 turn counter-clockwise. Backshift and try again. Continue tightening until it shifts. If it overshifts, going from the smallest cog to the third-smallest, loosen the cable by turning 1/2 turn clockwise. Backshift and repeat until it shifts exactly from the small to the next-smallest cog.

Fine adjustment of tension in the derailleur cable.





Now go to the second-smallest ring. Tighten or loosen the cable slightly, until the outer side plates of the chain are just clearing the third-smallest cog. Shift up and down, fine-tuning until you're satisfied.

Checking the position of the chain on the cogs.





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Hi, I have recently installed a new X9 derailleur in accordance with the manufactures' instructions. I have also relpaced the rear hanger. The gears shift ok, however, when in gear, especially the...


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http://www.parktool.com/blog/repair-help/rear-derailler-adjustments-derailleur

It sounds like your cable is/was a smidge too tight.

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