Box Two Bottom Bracket 24mm

Box Two Bottom Bracket 24mm

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Box Two™ 24mm External bottom brackets feature cold-forged and CNC-machined alloy cups, dual-labyrinth bearing covers and precision sealed bearings. They are the perfect match to Box Three™ and Four cranks, and the ultimate upgrade to the budget BBs sold with most cranksets. Box Two™ 24mm External Bottom Brackets are designed to fit all 24-millimeter crank spindles and frames with 68 or 73 x BC 1.37-inch bottom bracket shells.


  • High-Impact Anodizing
  • 24mm Outboard Bearings
  • ABS Plastic Sleeve
  • Abec-5 Bearings
  • CNC-Machined Alloy Cups


Compatibility Box Three™, Box Four™, Shimano HollowTech II, RaceFace X-Type
Material 6061-T6 Aluminum
Shell Width 68/73mm
Spindle Type 24mm
Thread 1.37 Inch x 24 TPI (English)
Weight 105 grams / 3.7 ounces