I didn’t replace the 10-speed crankset with an 11-speed one, so not all 22 gears engage as well as they should. I appear to have reached an impasse with Madison. Any suggestions?
A It is impossible to offer much advice on the reason for the rear mech’s demise without having seen it working prior to the incident. Was it regularly serviced by a competent mechanic? Were you pedalling hard and trying to change gear at the time? Was the damage caused by the mech moving into the spokes? Although shifting is controlled electronically, there are ‘stopper’ screws that prevent the mech over-shifting past the end sprockets. If the low gear stopper screw was correctly adjusted, it is hard to see how the derailleur could do this, which may explain Madison’s decision.
I assume you bought 11-speed dual-control shifters? Perhaps the best course of action would be to sell your surplus 10-speed components and use the proceeds to fund the purchase of an 11-speed chainset to complete your groupset and allow you to fully enjoy the delights of electronic shifting.
Cycle’s Technical Editor