The Pivot Shuttle AMP'd wires the SRAM XX Eagle Transmission directly into the Avinox M2S drive unit, so the derailleur runs off the bike's main battery instead of its own. That connection powers Avinox SmoothShift, which smooths out shifts under load and lets us shift while coasting through rock gardens without waiting for a clean pedal stroke. If the main battery ever runs dry, a partitioned reserve keeps the derailleur shifting for the ride home. What Our Gearhead(R) Experts Are Saying:"The dw-link keeps the rear wheel tracking through braking bumps that would normally kick a suspension platform sideways. I can feel the motor helping drive that wheel into the ground rather than fighting the suspension, which is why this bike stays composed on climbs that usually break my rhythm."