This is a 9speed drivetrain with Silver bar end shifters. My thoughts are: 1. Tighten up the D-rings in the bar end shifters. When they get loose, shifting stars jumping around. May need tightening twice a week or more. Beeswax works good on the Dribg bolt threads to keep them tight a long time. 2. Look under bottom bracket to be sure the shifter cables are running correctly in their channels and haven't popped out of place. 3. Check both derailers that they aren't bent or misaligned. 4. Check your Rear Derailer limit screws and adjust accordingly. 5. Try an 8-speed cassette and chain, assuming your derailer cages will allow the width of an 8-speed chain to pass through. You might get less auto shifting with the slightly wider spacing of the 8-speed cogs 6. Who built the bike? And are the crank/drivetrain components supposed to play well together?
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