Rockshox SID SL Ultimate Flight Attendant Race Day - 29", 15 x 110 110mm Gloss Black 44mm offset DebonAir D1Cross country purists We see you. Youre why SID SL Ultimate is the lightest XC fork on the trail. Now, with Flight Attendant, it is the smartest, most efficient, and most technologically advanced fork on the start line. SID SL Ultimate Flight Attendant features the new three position Charger Race Day 2 Flight Attendant electronic damper that automatically changes suspension state between Open, Pedal, and Lock positions faster than you can think.