ROCKSHOX BOXXER ULTIMATE

CONFIDENCE AND CONTROL. NO COMPROMISES.
Built on its high-performance legacy, the latest BoXXer was redesigned top to bottom to win races—or simply chase your buddies down the mountain. We could have made the stiffest fork possible, but we didn’t. We set out to deliver the best possible balance between stiffness, compliance, and comfort for maximum control. Two years of extensive development focusing on the critical blend of bending and torsional stiffness ratios resulted in the all-new 38mm BoXXer chassis.

After countless bike park laps, race runs, and lab test cycles, we found the perfect balance between ride quality, steering precision, and stiffness. It isn’t all about the numbers. It’s about giving you the control and feel you need to choose any line you like.

BoXXer’s 38mm stanchions are just the beginning. These upper tubes harmonize with the lowers to deliver ideal ride characteristics. Through extensive riding and testing, we tuned the stanchion wall thickness and lower leg architecture for stiffness that accepts steering input without beating up your hands. This way, you’re the one steering the fork, not the other way around.

New DebonAir+
BUILT TO HANDLE THE PRESSURE
BoXXer’s new DebonAir+ twin tube design is unlike any air spring we’ve made before—and it rides that way. The action is so coil-like, it’s uncanny. Off the top, BoXXer is impossibly responsive and supple, but it wants to eat when the big square-edged hits start coming. Best of all, BoXXer’s air spring is infinitely tunable with both air pressure and Bottomless Tokens. Beat that, coil spring.

The new BoXXer rides on the twin tube air spring, a separate air chamber that nests inside of the 38mm uppers. Designing the air spring to work within the ID of the 38mm upper tubes initially caused the spring curve to become too progressive for even the heartiest of DH racers. So, we added the twin tube and boosted the air spring shaft diameter from the traditional 10mm to a hollow 14mm shaft, creating extra negative volume for the air spring.

By adding the twin tube sleeve, we can precisely control the different spring volumes: positive, negative, and casting (think trapped air in the lower leg). This optimizes the positive air chamber volume for that hole-swallowing linear spring curve, our most linear spring curve yet. You can use every single millimeter of travel (if you need it).

At the top of the travel, we boosted the negative air chamber volume to better absorb small bumps. At the bottom of the stroke, a new jounce bottom-out bumper gives you soft, clank-free landings off the biggest drops. No matter if you’re cornering, careening through rocks, or on a choppy straightaway, BoXXer finds traction where you never thought to look.

SMOOTH IS FAST
BoXXer’s bushings get thirsty, so we found a way to keep them constantly lubricated as you pound through the roughest runs. Each upper tube has oil flow ports located near its bottom. As you crank out hot laps, these openings circulate more lube through the bushings. This fork gives friction the slip.

These oil flow ports have an added benefit when the fork is going through its travel on a wicked G-out. This new design evenly distributes air volume above the lower bushing, resulting in a consistent spring rate you can trust on the gnarliest drop-ins.

ButterCups
THE GOLDEN SOLUTION
The ButterCups you can’t live without in your 2023 Pike, Lyrik, and ZEB now reside in your BoXXer. Little gold-packaged rubber pucks live at the end of the damper and air spring shafts and fit into the lower leg of the fork. ButterCups dampen high-frequency vibrations before they hit your hands and arms and lead to an early end to an otherwise good day. Time to smash laps.

Charger 3 RC2
NO GUTS, NO GLORY
The revolutionary Charger 3 RC2 damper launched in our 2023 Pike, Lyrik, and ZEB forks is now making waves in our longest-travel DH fork. It took a fresh set of eyes to produce what became the original Charger 3 damper. We eliminated High Speed Compression (HSC) and Low Speed Compression (LSC) cross-talk—that overlap in adjustment functionality that ties HSC and LSC adjustments together, making truly independent tuning previously impossible. The result gives way to a new era of riding, where the decision between adding more damping and sacrificing your hands to a harsh ride doesn’t exist.

FEATURES

• NEW 38mm chassis designed to meet the needs of the world’s fastest racers with balanced stiffness and ride quality.
• NEW DebonAir+ twin tube air spring strikes the perfect balance between butter-smooth small bump feel, added support throughout the travel, and taller ride height for confidence when things get steep.
• NEW Signature colorway BoXXer Electric Red with an all-new graphics package.
• NEW RockShox premium fender compatibility (RockShox Bolt-On Fender included with purchase)
• NEW Lightweight machined and anodized crown for premium looks and durability.
• Short and tall crown options available to accommodate different head tube lengths.
• Charger 3 damper tuned for BoXXer’s updated chassis and spring. Featuring High Speed Compression, Low Speed Compression, and a revamped Low Speed Rebound, every click is meaningful and exact. This allows the rider to tune to perfection with every click.
• ButterCups block 20% of high-frequency “trail chatter” to reduce hand and arm fatigue, leaving you feeling fresh with more control.
• Ultra-low-friction SKF wiper seals provide long-lasting fork performance and improve overall suspension feel.
• Maxima Plush damping fluid reduces friction and silences damper noise.
• Maxima Plush Dynamic Suspension Lube reduces friction, lasts longer, and enhances suspension performance ride after ride.

SPECIFICATIONS

Wheel size 27.5", 29"
Travel (mm) 200mm
Damper Type Charger 3 RC2 W/ButterCups
Fork offset 52mm (29")
Color (FS) BoXXer Electric Red - Gloss, Gloss Black
Axle 20x110mm BOOST™
Upper tube type 38mm aluminum
Volume reducer 0/6 Tokens
Spring DebonAir+ W/ButterCups
Crown OD (mm) 42
Weight Based On 200mm, Short Crown (Weights same for 27.5" and 29")
Weight (g) 2880