[Jesse]’s design omits the servo present in Archer’s design, and uses the existing derailleur spring, with the reasoning explained in a nice spring physics refresher. Instead a stepper is used ...
As part of the trip to Spring Valley, MN, I joined other journalists in racing ... Shifting with the Di2 Dura-Ace front derailleur and Ultegra RX rear derailleur was smooth and reliable. The rain ...
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