You can mix a 10 speed Di2 Front Derailleur with an 11 speed Di2 Rear Derailleur and external Di2 battery, if you use old firmware versions. This guide explains for ...
Shifting with the Di2 Dura-Ace front derailleur and Ultegra RX rear derailleur was smooth and reliable. The rain forecast for Saturday pushed itself back to Sunday, and the resulting conditions were ...
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