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  • Box Components Box One 11-Speed Rear Derailleur
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Box ComponentsBox One 11-Speed Rear Derailleur

Item # BXC0004

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  • Black, 11-Speed, Wide Cage ($174.99)
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Item # BXC0004

Box One 11-Speed Rear Derailleur

Now, a very viable mountain bike rear derailleur option exists outside of brand's that begin with the letter S with Box Components' One 11-Speed Rear Derailleur. This model is a step up from its Two model, sporting more exotic materials to lower its weight and an adjustable clutch for fine-tuning. It enjoys a healthy amount of engineering, top-notch materials, and some lengthy R&D to build a derailleur that will fire off precise and reliable shifts for many seasons.

Box wouldn't think of bringing out a derailleur without a proper clutch and the One has a one which it dubs the Adjustable Tri-Pack Limited Slip Clutch. While this sounds like something more akin to something you'd see on a high-performance automobile, it's actually a highly refined derailleur clutch that does an excellent job reducing derailleur cage movement and chain slap while also providing better tension and increased wrap for better chain management. Its clutch pack consists of disc springs, pressure plates, friction discs, and a one-way roller bearing to provide a great deal of force in a small package that's adjustable to dial in shift feel and chain retention and is also fully-serviceable.

The derailleur uses durable 3D forged linkages helping to improve its impact resistance and strengthens the material for impressive durability. Its cage and body use 6061-T6 aluminum and carbon fiber and nylon composite to drop grams and allow the derailleur to not flinch in the face of kicked up sticks, slickrock slabs, and mud. Other unique details include its impact resistant, spring-loaded cable stop that keeps the cable and housing out of harm's way and its closed bushings at the pulleys.

The Box Two 11-Speed Rear Derailleur comes in the color Hard Onyx and is designed for Box's 11 Speed mountain bike groups including its One and Two 11-speed shifters. The Wide Cage version accommodates up to a 46 tooth cassette cog.

  • Box's rear derailleur ready to compete against the establishment
  • Durable aluminum and carbon construction stands up to trail abuse
  • Adjustable Tri-Pack Limited Slip Clutch prevents dropped chains
  • Durable 3D Forged Linkages boosts durability
  • Compatible with Box 11-speed drivetrains
  • Pivot-Tech Impact resistant, spring-loaded cable stop keeps housing out of harm's way
Tech SpecsWeight
Tech Specs
6061-T6 aluminum, carbon fiber, nylon composite
Cage Length
Cassette Range
11 - 46t
Box 11-speed
Recommended Use
Manufacturer Warranty
limited lifetime

Actual Weight

Actual weights are measured in-house by the Competitive Cyclist team.

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Black, 11-Speed, Wide Cage

Claimed Weight

Claimed weights are provided by the vendor.

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