Features1Aluminum Alloy: This bike bottom bracket has aluminum alloy frame, and it is glossy, light weight and it also has low noise and high strength. 2High Stability: The bike crank axis adopts enhanced lateral design to enhance stability, which is not easy to loosen and has no abnormal noise. 3Accurately Machined: Bike bottom brackets are accurately machined, with long service life, high strength and good sealing performance. 4Easy to Install: The bike bottom bracket is light in weight, small in size and easy to install and use that is a great accessory for cyclists. 5Parameter: The outer diameter is 46mm, five way width is 68mm to 73mm, applicable for SRAM DUB chainring, the chainring axis is 28.99mm.SpecificationItem Type: Bike Bottom BracketMaterial: Aluminum alloyGross Weight: 146g/5.2ozOuter Diameter: 46mm/1.8inFive Way Width: 68-73mm/2.7-2.7inSuitable to Chainring: For SRAM DUBchainringChainring Axis: 28.99mm/1.1inPackage List1 xBike Bottom Bracket3 xGasket