Check the shifter handles also check your cables and cable covers check anchor bolts frame clips anything that can cause your cables to come out of adjustment shimano is quality stuff so start at the shifters and work back to the derailleur .hope this helps
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Check the shifter handles also check your cables and cable covers check anchor bolts frame clips anything that can cause your cables to come out of adjustment shimano is quality stuff so start at the shifters and work back to the derailleur .hope this helps