Box Two 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 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 x BC 1.37” bottom bracket shells.
Material 6061-T6 Aluminium Shell Width 68mm Thread 1.37" x 24 TPI
Weight 105 grams / 3.7 ounces