Box Two 24mm External bottom brackets feature cold-forged, 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.
Features
Forged CNC-Machined Alloy Cups
High-Impact Anodizing
24mm Outboard Bearings
ABS Plastic Sleeve
Precision Abec-5 Sealed Bearings
Specifications
| Compatibility | Box Three, Box Four, Shimano HollowTech II, RaceFace X-Type |
|---|---|
| Material | 6061-T6 Aluminum |
| Shell Width | 68mm/73mm |
| Spindle Type | 24mm |
| Thread | 1.37 Inch x 24 TPI |
| Weight | 105 grams / 3.7 ounces |














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