RockShox SID Ultimate FA 29" Fork 3P Crown 120mm Blk D1 >SID Ultimate Flight Attendant featurings a formidable 35mm chassis that holds the line when youre on the edge. With the Flight Attendant system, this fork is more efficient and advanced than ever before. Flight Attendant algorithm uses a suite 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