RockShox SID 35 Flight Attendant DamperUpgrades existing and current SID (C1 E1 Generations) Fork Only update enables the Flight Attendant system to seamlessly adapt to hardtail bikes Charger Race Day 2 Flight Attendant electronic damper features an automatic three position Compression adjustment (Open Pedal Lock positions) with independent adjustable Rebound Flight Attendant system requires a Flight Attendant fork and an AXS pedal sensor or power meter, with optional AXS components