Ask a Mechanic | Mis-Shifting Rear Derailleur with New Rear Wheel Ask a Mechanic | Mis-Shifting Rear Derailleur with New Rear Wheel Daniel2015-12-16T15:26:23-08:00 Question: I've gone through your video on Di2 rear derailleur adjustment, and the chain Ask a Mechanic | Mis-Shifting Rear Derailleur with New Rear WheelDaniel2015-12-16T15:26:23-08:00