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Rockshox Boxxer Ultimate D1 Fork

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Available in store

Article number: FS-BXR-ULT-D1
SKU: 00.4020.955.002

Redesigned by the world’s fastest racers, for the world’s fastest racers, you want the BoXXer in your corner.


The all-new 38mm chassis is equipped with the DebonAir+ twin tube air spring that will have you thinking it’s a coil. Paired with a Charger 3 RC2 damper tuned for downhill speed, BoXXer Ultimate takes you straight to the top step of the podium. And with Rockshox new crown adjustment lines, setup is a breeze—no rulers required.

  • 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 (Bolt-On Fender included with purchase)
  • NEW Lightweight machined and anodized crown for premium looks and durability
  • NEW Crown height gradient creates a visual guide to simplify setup, no ruler required
  • 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
  • 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


  • WHEEL SIZE: 27.5" // 29"
  • TRAVEL: 200mm
  • AXLE: 20x110mm Boost
  • OFFSET: 44mm (27.5") // 48mm (27.5") // 48mm (29") // 52mm (29")
  • STEERER: 1-1/8" Aluminum
  • DAMPER: Charger 3 RC2 W/ButterCups
  • SPRING: DebonAir+ W/ButterCups
  • MIN/MAX ROTOR SIZE: 200mm/220mm
  • MAX TIRE WIDTH: 81mm
  • COLOR: Gloss Black // "Electric Red" Gloss
  • WEIGHT: 2880g (200mm, Short Crown, Weights same for 27.5" and 29")
  • ITEM #: 00.4020.955.007 // 00.4020.955.003 // 00.4020.955.006 // 00.4020.955.002 // 00.4020.955.005 // 00.4020.955.001 // 00.4020.955.004 // 00.4020.955.000

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