RockShox Deluxe Ultimate RCT Rear Shock, 185 x 50mm, Trunnion, Trek Top

Custom tuned by the Trek Suspension Lab, this RockShox Deluxe Ultimate RCT rear shock is the correct factory replacement shock for Trek Top Fuel 29 models. Built around RockShox’s DebonAir air spring and Ultimate-level damper, it delivers excellent small-bump sensitivity, strong mid-stroke support, and controlled performance across varied trail conditions.

This shock uses Trek-specific tuning and hardware dimensions to ensure proper suspension kinematics and ride feel when installed on compatible Top Fuel frames.

• Brand: RockShox

• Model: Deluxe Ultimate RCT

• Intended Frame: Trek Top Fuel 29

• Eye-to-Eye: 185mm (Trek-listed as 184mm equivalent)

• Stroke: 50mm

• Spring Type: Air (DebonAir)

• Damper Type: RCT

• Mount Type (Upper): Trunnion

• Upper Mount Width: 54mm

• Upper Hardware Diameter: 10mm

• Mount Type (Lower): Pin

• Lower Mount Width: 30mm

• Lower Hardware Diameter: 8mm

• External Adjustments: Rebound

• Remote Compatible: No

• Tune: Trek Suspension Lab custom tune

• DebonAir air spring provides a smooth, consistent feel through the full travel range

• Ultimate-level damper offers refined control and trail stability

• Trek-specific tune ensures correct leverage curve and ride characteristics

• Compact trunnion mount improves frame clearance and stiffness

• Designed as a direct replacement shock for compatible Top Fuel frames

• Trek-specific shock tune is required for correct performance

• Designed for Trek Top Fuel 29 frames only

• Eye-to-eye measurement may be listed as 184mm or 185mm depending on manufacturer reference, this is the correct Trek fitment

• Installation recommended by a professional mechanic to ensure proper hardware fit and torque

On trail, the Deluxe Ultimate RCT delivers a supple initial stroke with excellent traction, followed by predictable mid-stroke support that keeps the bike composed during aggressive riding. The Trek-tuned damper balances efficiency and control, making it equally capable on technical climbs and fast, flowing descents.

This listing is for a genuine RockShox Deluxe Ultimate rear shock, custom tuned by the Trek Suspension Lab.
Non-retail packaged. Includes only the shock as pictured.
Covered under Trek and RockShox manufacturer warranty when installed on a compatible Trek frame.