.two. External Sealed Bottom Bracket
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 or 73 x BC 1.37” bottom bracket shells.
|Thread||1.37" x 24 TPI (English)|
|Weight||105 grams / 3.7 ounces|