RockShox Super Deluxe Ultimate D1 Rear shock 230x57.5 Shaft Eyelet: Standard Body Eyelet: Standard Token Loc 0 Reb55/Comp37 Lockout45 Trek Rail Gen4 2020-2024

LinearXL air spring with easy-to-adjust "o-ring" tokens RCT2 damper providing a wide, usable range of Low Speed Compression (LSC) and High Speed Compression (HSC) adjustments without any cross-talk Base valve with 40% reduction in IFP forces, making it the most supple shock on the market while maintaining perfect traction Main piston compression tunes matched in performance to the Charger 3.2 damper, focused on providing mid-stroke support Jounce Bottom Out bumper paired with optional Hydraulic Bottom Out kicks in to restrict the flow of oil within the last 20% of travel, offering a soft hydraulic cushion that reduces harsh bottom out Removable Rebound knob doubles as HSC adjuster Max PSI increased to accomodate higher system weights SRAM Model ID: RS-SDLX-ULT-D1