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BoXXer Ultimate Charger 3 29in Boost Fork
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Warning: California Proposition 65
Take on steep lines with absolute confidence aboard the BoXXer Ultimate 29in
What Our Gearhead® Experts Are Saying:
"I’ve had the BoXXer Ultimate 29 on my DH bike all season and it’s been flawless. The Charger 3 RC2 damper makes dialing in settings super easy, and the ButterCups really do reduce fatigue on long runs. It just feels planted at speed and floats through chunky stuff."
We rely on the RockShox BoXXer Ultimate 29" when the mountain demands precision, power, and pure downhill speed. Designed with input from world-class riders, this fork is built around a brand-new 38mm chassis for optimal stiffness and tracking. Whether we’re charging through bike park features or navigating steep technical race courses, the 200mm of buttery DebonAir+ travel gives us confidence and control, while ButterCups keep our hands fresh from first run to last.
It’s the small details that set this fork apart. The Charger 3 RC2 damper features external adjusters for high- and low-speed compression and rebound, offering intuitive and exact tuning for race-day confidence or freeride flow. RockShox even added setup lines to the crown for easy alignment—no measuring tape required. With options for 48mm or 52mm rake and an included bolt-on fender, the BoXXer Ultimate 29 delivers the performance we need and the looks to match.
Details
- Engineered for elite downhill mountain bike racing
- 200mm of DebonAir+ travel with ButterCups for big-hit control
- Charger 3 RC2 damper delivers external HSC, LSC, and rebound tuning
- 38mm stanchions and dual crown design increase steering precision
- Ultra-low-friction SKF seals and Maxima Plush fluids boost performance
- Compatible with 29in wheels and post mount disc brakes
- Includes RockShox bolt-on fender and setup markings on crown
- Available in 48mm or 52mm offset to match handling preference
- Item #RSXB07E
- Travel
- 200mm
- Stanchion Material
- aluminum
- Lower Material
- magnesium
- Crown Material
- aluminum
- Wheel Size
- 29in
- Steer Tube Diameter
- 1-1/8in
- Stanchion Diameter
- 38mm
- Rake
- 48mm, 52mm
- Spring Type
- DebonAir+ Twin Tube Air Spring, ButterCups
- Damper
- Charger 3 RC2, ButterCups
- Adjustability
- high, low, rebound
- Axle
- 20x110mm BOOST™
- Brake Compatibility
- post mount
- Rotor Compatibility
- 200mm+
- Includes
- RockShox Bolt-On Fender
- Claimed Weight
- 6lb 5.6oz (2880g)
- Manufacturer Warranty
- 2 years
- Activity
- downhill
- Manufacturer Part Number
- 00.4020.955.000, 00.4020.955.001
BoXXer Series
Totally Predictable
Predictability is fundamental. Riding BoXXer proves it.
Fundamentals Of Faster
Composure = Speed
BoXXer better isolates impact and vibration but still allows feel for bike and terrain inputs.
Simple Setup
The all-new BoXXer visibly indicates settings and makes fine-tuning easy.
Enable The Air Spring
LinearXL is a whole fork approach to air spring design, delivering predictable position-sensitive control.
Faster From The Inside Out
Stanchions That Breathe
Strategically placed breather holes in the stanchions allow for the lower leg air volume to increase as the fork goes through its travel.
Charger 3.2
Re-tuned for the unique position-sensitivity of LinearXL, Charger 3.2 delivers speed-sensitive control with fully independent High Speed and Low Speed Compression damping.
Linear XL AirAnnex
The AirAnnex on BoXXer’s lower leg increases the lower leg air volume, which reduces the air-spring progressivity and speed-sensitivity inherent to traditional lower leg designs.
Precision, Not Vibration
Our most aggressively precise 38mm chassis, optimized for race-winning speed. Precise speed, without the deflection and energy-robbing vibration typical of forks with excessively large stanchions.
ButterWagonTech
ButterWagonTech is a proprietary matrix of divots on BoXXer stanchions that works to carry (or ‘wagon’) fresh layers of our exclusive, high-density Maxima oil to the bushings with every millimeter of travel.
Predictability Is Linear
LinearXL provides a position-sensitive linear curve. That means as you move through the travel, the rate at which the fork increases force never changes, delivering predictability.
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RockShox: Built for Bigger Hits
RockShox pioneered mountain bike suspension and keeps pushing it forward, building forks, shocks, and droppers that stay composed in the big hits and keep riders faster, more supported, and in control when the trail turns fast and rough.
Cancer - P65Warnings.ca.gov