RockShox

SID SL Ultimate Flight Attendant 29in Boost Fork

What Our Gearhead® Experts Are Saying:

"This fork is a revelation. It removes the guesswork and lets me hammer. Flight Attendant reads terrain and pedaling input instantly, switching between modes way faster than I could with a manual lever. It’s light, precise, and always in the right setting—no compromises, just pure speed."

The SID SL Ultimate Flight Attendant fork marks the cutting edge of XC racing suspension—an ultralight chassis with real-time, wireless intelligence baked in. With 100mm or 110mm of travel and a 44mm offset tuned for today’s aggressive XC bikes, it balances weight, stiffness, and response at the highest level. The 32mm Fast Black stanchions and forged aluminum crown deliver a stiff, efficient ride, while magnesium lowers keep the weight impressively low.

At the heart of this system is the Flight Attendant-controlled Charger Race Day 2 damper, which uses a suite of sensors to read rider inputs and trail conditions, then automatically switches between Open, Pedal, and Lock positions. This technology adapts in milliseconds to maximize traction and pedaling efficiency. The system is fully customizable via SRAM AXS integration, with options to disable Pedal or Lock modes and fine-tune the fork’s behavior to your exact preferences.

The DebonAir+ air spring offers smooth early travel and dependable mid-stroke support—critical for both long races and fast, chattery descents. The fork is fully wireless and comes complete with a battery, charger, and Maxle Stealth thru-axle. It’s purpose-built for hardtail race bikes or ultralight full-suspension platforms where riders want the fastest, smartest fork on the market—ready for the front row on any start line.