Lyrik E1 Ultimate Flight Attendant 29in Boost Fork

What Our Gearhead® Experts Are Saying:

"The Lyrik E1 Ultimate Flight Attendant 29in Boost Fork represents a genuine step change in what a trail fork can do. The Flight Attendant algorithm has been improved to personalize adjustments based on your specific riding style and terrain, not just generic open and closed positions, and the difference versus the previous generation is immediately apparent on varied trails where the transitions used to feel slightly behind the terrain. Stack that on top of the LinearXL spring, Charger 3.2 damping, and ButterWagonTech, and there is simply nothing else at this level in the trail fork category."

The Lyrik E1 Ultimate Flight Attendant 29in Boost Fork starts from the same performance foundation as the rest of the E1 Lyrik Ultimate lineup and then adds a layer of intelligence that changes the nature of the product entirely. Flight Attendant is not a gimmick or a convenience feature. It is a fully automatic wireless suspension system with an improved algorithm that processes terrain input, rider effort, and personal preference data simultaneously to make real-time damping adjustments that no manual lever or compression knob can replicate with the same speed or consistency.

The improved Flight Attendant algorithm personalizes its behavior over time, learning how a specific rider approaches specific terrain and refining its adjustments accordingly. On a long trail ride with varied gradients, the fork opens for descending sections, firms for climbing efficiency, and handles every transition in between without the rider ever removing a hand from the bars. Fully AXS-enabled and wireless, it integrates cleanly into existing SRAM AXS ecosystems and disappears into the cockpit with no additional cables or controls to manage.

The mechanical platform that Flight Attendant operates on is the strongest version of the Lyrik to date. The LinearXL air spring with externally Adjustable Bottom Out delivers the coil-like ride quality that defines the E1 generation, with supple small-bump sensitivity off the top of the stroke, progressive mid-stroke support, and a physically tunable end-stroke character that lets riders dial in bottom-out feel independently from overall spring rate. The Flight Attendant Charger 3.2 damper incorporates ButterCups technology, which isolates and absorbs 20 percent of high-frequency trail chatter before it reaches the rider's hands and arms, a benefit that compounds meaningfully over long days on rough terrain where fatigue accumulates in the upper body as much as the legs.

ButterWagonTech, exclusive to the Ultimate tier across the Lyrik lineup, addresses long-term performance consistency by maintaining a constant supply of oil to the upper tube bushings throughout the entire service interval. Combined with low-grab SKF wiper seals and Maxima 920 blended 15-weight oil throughout the system, the Lyrik E1 Ultimate Flight Attendant 29in Boost Fork is engineered to perform at its ceiling on the last ride before a service just as reliably as it does on the first. At 2340 grams in 160mm 29-inch configuration without a battery, it delivers all of this capability without the weight penalty that the feature set might suggest.