RockShox SIDLuxe Ulti FA Rear Shock185x50 TrekTopFuel A3

Uses a suite of sensors to read rider and terrain inputs to anticipate the perfect suspension position- Adaptive Ride Dynamics enables the Flight Attendant system to learn from the rider to make smarter, more personalized decisions for greater efficiency and even more speed.- Three-position remote damping system: Open, Pedal, and Lock- High speed compression damping blow-off for Open and Pedal positions- Super-light XC design delivers premium performance and efficiency- Designed to be used in conjuction with Flight Attendant equipped SID forksTuned for Trek Top Fuel, Gen 3-4