Bottom Brackets / Box Two Alloy External BB

Box Components

The Box Two Alloy External Euro Threaded 24mm Bottom Bracket features cold-forged and CNC-machined alloy cups, dual-labyrinth bearing covers and precision sealed bearings. It's the perfect match to Promax CF-2 and HF-2 cranks and the ultimate upgrade to the budget BBs sold with most crank sets. Box Two External Bottom Brackets are designed to fit all 24-millimeter crank spindles and frames with 68 or 73 x BC 1.37 bottom bracket shells.

Material 6061-T6 Aluminum
Shell Width 68/73mm
Thread 1.37" x 24 TPI (English)
Weight 105 grams / 3.7 ounces



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