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Old 10-17-10, 01:02 AM
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BCRider
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Location: The 'Wack, BC, Canada
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Very likely all that you need is to slightly adjust the thimble on the derrailleur to even the up and downshifts. This sort of periodic adjustment is extremly basic and should become second nature to you. If you didn't know about this and don't know how to do it then it is high time you learned. There are a few basics about riding a bike that all riders should know and trimming the cable to even up the shifting is one of them.

If you do know about this and tried it and the shifting is still being delayed then you can move on to suspecting a frayed or gunked up cable or a housing that the cable has worn a tight fitting groove into the inner lining and it's grabbing at the cable. If cleaning the cable and housing out doesn't fix it then swap out the housing. If the cable is kinked or frayed at all then swap that out as well. Once you do that and re-trim the shifting it should be good for a while.
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