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Box Two 35mm Bottom Bracket

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About This Product: Box Two 35mm Bottom Bracket

The Box Two 35mm Bottom Bracket is another incarnation of Box’s Oversized Technology design philosophy. Box admits this is a large bottom bracket, but they rationalize the design decision, by first moving material from less stressed areas to higher stressed ones, then they use Enduro’s precision bearings to create a near instant response to pedal input.


  • B52 Technology
  • ABS Plastic Sleeve
  • BB30 or PF30 Compatible
  • Outboard Bearings
  • Enduro™ Bearings
  • Oversized™ 35mm
  • Oversized Technology™


  • COMPATIBILITY: Box One™ M35 only
  • SHELL: PF30 or BB30 only
  • SPINDLE TYPE: Box/Praxis™ M35 only
  • WEIGHT: 138 grams / 4.9 ounces