Box Four 2-Piece Crankset - boxcomponents

Box Four 2-Piece Crankset

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The Box Four Crankset features a 2-piece design with an oversized bottom bracket interface. The 24mm spindle is pressed into the drive-side crank arm for durability and easy installation. The non-drive side crank arm features a 2-bolt pinch system for added strength. Our unique 4-bolt 104 BCD spider features a flex-resistant ring for optimum performance.

Box Four Cranks feature steel pedal inserts that require pedal washers and external sealed bearing BSA bottom brackets, and both are provided in the box.

  • Oversized Bottom Bracket Interface
  • Durable Cold-Forged Construction
  • Dual Pinch Bolts for Even Clamping Force
  • 4-bolt 104 BCD Spider with Flex-Resistant Ring
  • 24mm Chromoly Spindle


  • Box Two Chainring
  • Box One Chromoly Chainring Bolts
  • Box One 7075 Alloy Chainring Bolts
  • Box Two 24mm bottom bracket
  • Box Extremum RacePrep bottom bracket
For compatibility questions, please click here

    160mm 165mm 170mm
    BB (Included) BSA 1.37 BSA 1.37 BSA 1.37
    Spindle 24mm Chromoly 24mm Chromoly 24mm Chromoly
    Material 6061 T-6 Aluminum 6061 T-6 Aluminum 6061 T-6 Aluminum
    Process Cold-Forged Cold-Forged Cold-Forged
    Chainline 44.5mm 44.5mm 44.5mm
    Weight 900 grams / 31.7 ounces 900 grams / 31.7 ounces 900 grams / 31.7 ounces