Built for World Cup-level downhill performance, the RockShox BoXXer Ultimate is designed to deliver maximum control, traction, and composure when the trail gets fast, steep, and rough. With 200mm of travel, a stiff 38mm chassis, and RockShox’s latest suspension technology, the BoXXer Ultimate is ready for everything from race-day precision to all-day bike park laps.
At the heart of the latest BoXXer Ultimate is the LinearXL air spring, engineered to deliver a smooth, predictable feel throughout the entire stroke. It offers a supple initial stroke for traction and small-bump sensitivity, supportive mid-stroke performance when pushing hard through corners and compressions, and a jounce bottom-out bumper for controlled end-stroke performance on big hits.
The Charger 3.2 RC2 damper provides independent high-speed and low-speed compression adjustment along with rebound adjustment, giving riders precise control over fork performance. Numbered compression controls make it easy to track settings and fine-tune the fork for different terrain, tracks, and riding styles.
RockShox ButterCups help isolate high-frequency trail chatter before it reaches the rider, reducing hand and arm fatigue while improving control through rough terrain. ButterWagonTech, exclusive to Ultimate-level forks, continuously supplies lubrication to the bushings to reduce friction and maintain smooth performance throughout the service interval.
Highlights
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200mm travel built for downhill racing and bike park riding
- 29” wheel compatibility
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38mm aluminum stanchions for a stiff and precise chassis
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Charger 3.2 RC2 damper with independent high- and low-speed compression adjustment
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LinearXL air spring delivers a smooth, supportive, coil-like ride feel
- Jounce bottom-out bumper provides controlled end-stroke performance
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ButterCups technology helps reduce high-frequency trail chatter
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ButterWagonTech continuously supplies lubrication to the bushings
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Low-grab SKF wiper seals help reduce friction and maintain smooth performance
- Numbered compression adjusters simplify suspension setup
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20x110mm Boost front axle
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Compatible with 200–220mm brake rotors
- Bolt-on fender compatible
- E-bike approved
Specifications
Wheel Size: 29”
Travel: 200mm
Damper: Charger 3.2 RC2 with ButterCups
Air Spring: LinearXL with ButterCup
Stanchion Diameter: 38mm
Fork Offset: 48mm or 52mm
Axle: 20x110mm Boost
Steerer: 1-1/8” Aluminum
Maximum Tire Width: 81mm
Minimum Rotor Size: 200mm
Maximum Rotor Size: 220mm
Fender Compatibility: Bolt-on short fender
E-Bike Approved: Yes
Whether you’re chasing seconds between the tape or hammering lap after lap at the bike park, the RockShox BoXXer Ultimate delivers the control and consistency demanded by modern downhill riding. With its LinearXL air spring, Charger 3.2 RC2 damping, and race-proven dual-crown chassis, it’s built to stay composed when the terrain is anything but.
