Old 05-05-14, 11:18 AM
  #2  
TrojanHorse
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Location: Whittier, CA
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Typically... your components will settle in as they get used, so what was previously a perfectly adjusted cable probably needs a little tweaking. Some people call it cable stretch but yes, your solution is likely a simple adjustment of the barrel adjuster back by the rear derailleur. Things to think about when riding - when you shift, does your drive train like to go UP to a larger cog or DOWN to a smaller cog? If your cable is a tad loose, your shifter will be reluctant to shift up, and you can turn that barrel adjuster a few clicks counter clockwise to compensate. (it's threaded, so turning it clockwise will turn the barrel INTO the RD, turning it counter clockwise will turn it OUT of the RD, which will have the effect of tightening the cable)

You can also get behind your bike and check out where the RD lines up the chain - is it perfectly lined up? If it's sort of between two cogs you may get the ghost shifting you're talking about.
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