RockShox

RockShox BoXXer Ultimate D2

Name: RockShox BoXXer Ultimate D2
Brand: RockShox
SKU: 140990
Rating: 4.6 (1 reviews)

In Stock

The RockShox BoXXer Ultimate D2 is a 200mm, race-ready enduro/DH fork delivering composure, low friction and tactile tuning via Charger 3.2 and LinearXL/DebonAir+.

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Available Options

Option	Price	Availability
RockShox, BoXXer Ultimate D2, Suspension Fork, 27.5'', DebonAir+ W/ButterCups, 200mm, 1-1/8'', 20x110mm Boost TA, Rake: 48mm, Red	—	In Stock
RockShox, BoXXer Ultimate D2, Suspension Fork, 27.5'', DebonAir+ W/ButterCups, 200mm, 1-1/8'', 20x110mm Boost TA, Rake: 48mm, Black	—	In Stock
RockShox, BoXXer Ultimate D2, Suspension Fork, 27.5'', DebonAir+ W/ButterCups, 200mm, 1-1/8'', 20x110mm Boost TA, Rake: 44mm, Red	—	In Stock
RockShox, BoXXer Ultimate D2, Suspension Fork, 27.5'', DebonAir+ W/ButterCups, 200mm, 1-1/8'', 20x110mm Boost TA, Rake: 44mm, Black	—	In Stock
RockShox, BoXXer Ultimate D2, Suspension Fork, 29'', Linear XL W/ButterCup, 200mm, 1-1/8'', 20x110mm Boost TA, Rake: 52mm, Red	—	In Stock
RockShox, BoXXer Ultimate D2, Suspension Fork, 29'', Linear XL W/ButterCup, 200mm, 1-1/8'', 20x110mm Boost TA, Rake: 52mm, Black	—	In Stock
RockShox, BoXXer Ultimate D2, Suspension Fork, 29'', Linear XL W/ButterCup, 200mm, 1-1/8'', 20x110mm Boost TA, Rake: 48mm, Red	—	In Stock
RockShox, BoXXer Ultimate D2, Suspension Fork, 29'', Linear XL W/ButterCup, 200mm, 1-1/8'', 20x110mm Boost TA, Rake: 48mm, Black	—	In Stock

Product Details

Technology & Performance — Composure from top to bottom

BoXXer Ultimate D2 is engineered to keep runs predictable: big 38mm stanchions, a stiff aluminum crown and magnesium lowers create a rigid chassis that resists flex when speeds climb and hits compound. The LinearXL (DebonAir+ on some 29" variants) air spring paired with a jounce bottom-out bumper gives a progressive, controllable end-stroke so you avoid hard, sudden impacts while still using full travel. The Charger 3.2 damper delivers quiet, consistent damping with externally adjustable low- and high-speed compression plus rebound tuning. ButterWagonTech sustains an even oil supply to the bushings for lower friction across the service interval, while ButterCups attenuate high-frequency trail chatter—reducing rider fatigue and improving traction on long, rough descents.

Key Features & Specifications

The BoXXer Ultimate D2 packs race-grade features that matter on steep, technical tracks. Highlights include a numbered control bezel for intuitive compression adjustments, Boost 20x110mm axle spacing, a 1-1/8" aluminum steerer, 200mm of travel, and support for up to a 220mm rotor and an 81mm tire width. Materials are premium: aluminum crown and stanchions with magnesium lowers for an ideal stiffness-to-weight balance. • Damper: Charger 3.2 with ButterCups for silent, precise damping • Spring: LinearXL / DebonAir+ with bottomless tokens and air pressure tuning • Construction: Aluminum crown & stanchions, magnesium lowers • Fitment: 27.5" and 29" wheel variants, 20x110mm Boost TA axle

Fit, Compatibility & Setup

The BoXXer Ultimate D2 is offered in multiple rake and wheel-size configurations (44mm, 48mm, 52mm rake; 27.5" and 29" options). Choose a rake to tune steering response: lower rake for quicker handling, higher rake for stability at speed. The 20x110mm Boost TA axle and 1-1/8" steerer fit most modern gravity frames, and the fork is e-bike approved for compatible motor systems. Installation and setup notes: the fork accepts up to a 220mm rotor and tires up to 81mm wide. Use the Control Bezel’s numbered compression dial to start at '0' then incrementally add damping. Adjust air pressure and bottomless tokens to dial mid-stroke support, and confirm steerer length and crown race compatibility with your frame before cutting or installing.

Who the BoXXer Ultimate D2 Is For

This fork is designed for aggressive enduro, downhill and gravity riders who demand composure, tunability and durability in race or park settings. If you race enduro stages, push big bikes in bike parks, or convert a frame for freeride, the BoXXer Ultimate D2 gives the high-speed support and damping control those use cases require. It's also a top pick for e-MTB gravity builds thanks to its e-bike approval—the robust chassis and advanced damping tech maintain consistent performance even under heavier loads and sustained descents.

Key Features

✓ 200mm travel with 38mm stanchions for aggressive enduro and DH terrain
✓ Charger 3.2 damper for quiet, precise damping and easy external tuning
✓ LinearXL / DebonAir+ spring with jounce bumper for end‑stroke control
✓ ButterWagonTech maintains oil to bushings, reducing friction over time
✓ ButterCups reduce high‑frequency trail chatter to lower rider fatigue
✓ Aluminum crown and stanchions with magnesium lowers for stiffness and resilience
✓ Boost 20x110mm TA axle, 1-1/8" steerer, supports up to 220mm rotor

Specifications

Brake Type	Disc
Damping	Charger 3.2 w/ ButterCups
Damping Adjustments	Extl begin stroke rebnd, low speed comp, high speed comp
Crown Material	Aluminum
Rake	48mm
Maximum Rotor Size	220mm
Maximum Tire Width	81mm
Primary Color	Red
Spring Adjustments	Air pressure, Bottomless tokens
Spring Type	DebonAir+ W/ButterCups
Steerer Tube	1-1/8''
Steerer Tube Material	Aluminum
Lower Tubes Material	Magnesium
Stanchions Material	Aluminum
Travel	200mm
Wheel Diameter	27.5''
Stanchions Diameter	38mm
Axle/Hub spacing	20x110mm Boost TA
e-Bike approved	Yes

Product Identifiers

Vendor Item #	00.4021.277.000
UPC	710845926907

Frequently Asked Questions

What wheel sizes and rake options are available for the BoXXer Ultimate D2?

The BoXXer Ultimate D2 comes in 27.5" and 29" wheel options with rakes available at 44mm, 48mm and 52mm depending on the variant. Choose rake to tune handling—lower rake quickens steering, higher rake adds high-speed stability.

Is this fork compatible with my e-MTB?

Yes — the BoXXer Ultimate D2 is e‑bike approved. Verify your frame accepts a 1-1/8" steerer and 20x110mm Boost TA axle, and ensure your e-MTB motor and geometry align with a 200mm travel gravity fork before installing.

How do I tune the fork for a heavier rider or big hits?

Increase air pressure to raise spring rate, add bottomless tokens for progressive mid-to-end stroke support, and use the Control Bezel to add compression on the numbered scale. For big hits, slightly increase high-speed compression and confirm rebound is set to control recovery without packing down.

What maintenance does the BoXXer Ultimate D2 require?

ButterWagonTech and ButterCups reduce friction and chatter between services, but regular maintenance is still recommended. Follow RockShox service intervals for damper and air spring service; have seals and oil checked by a qualified tech periodically to preserve performance and longevity.

Can I fit a front fender or mudguard to this fork?

Yes — the BoXXer Ultimate D2 supports bolt-on fender compatibility with both front and rear coverage. Use the dedicated mounts and ensure clearances for your wheel and tire size when installing a larger rotor or wide tire.

What rotor size and tire width does it support?

The fork supports a maximum rotor diameter of 220mm and a maximum tire width of approximately 81mm. Always double-check frame and caliper clearance when running large rotors or plus-size tires.

Buying Guide

When choosing a gravity or enduro fork, prioritize travel, stanchion diameter, damper technology and axle standard to match your bike and riding style. A 200mm travel fork with 38mm stanchions like the BoXXer Ultimate D2 offers the stiffness and travel needed for steep, technical descents and park laps. Consider wheel size and rake for handling, confirm steerer and axle compatibility with your frame, and check e‑bike approval if using an electric drivetrain. Factor in serviceability and local dealer support—advanced features like Charger 3.2 and ButterWagonTech reward proper setup and periodic maintenance.

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