Jumping gears on Ultegra



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leoj

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Sep 15, 2003
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I bought Bianchi Vigorelli 2 weeks ago and from day 1 I have chain jumping on some of the rear gears between neighbouring cogs. It is Shimano Ultegra for everything on this bike. It is wors when I am using smallest or largest chainrings and somewhat better on the medum one. Any ideas on how to fix this?
 
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