Features1The bike bottom bracket is made of aluminum alloy, which is durable and has a long service life 2Equipped with highprecision sealed bearings to ensure steady rotation of the bearings, which can well meet your needs 3The inner diameter of the bottom bracket is 24mm/0.9in, suitable for bicycles with a 6873mm/2.72.9in bottom bracket 4The small size and light weight of the bottom bracket is good for carrying and storage, so the bottom bracket is convenient to use 5Has a wide range of applicability, suitable for mountain bikes, road bikes, folding bikes and other modelsSpecificationItem Type: Bike Bottom BracketProduct Material: Aluminum AlloyStyle: BB91Inner Diameter: Approx. 24mm/0.9inApplication: Bottom Bracket Approx. 68-73mm/2.7-2.9inPackage List1 x Bike Bottom Bracket