Use: Crank-American This bearing is used in American bottom brackets, commonly found on older or less expensive bikes with one-piece cranksets. These are also known as Ashtabula or OPC (One Piece Crank) bottom brackets.
Fits: 1/Piece This bearing fits one-piece cranks, which are a single forged piece of metal forming both crank arms and the spindle.
Ball Size: 5/16 Each ball bearing in the assembly has a diameter of 5/16 inches. This size is standard for many American bottom brackets.
Ball Qty: 9 There are 9 ball bearings in the cage or retainer. This number affects the load distribution and smoothness of the bearing.
Brand: AltaLine is the brand that manufactures these bearings, known for producing various bicycle components.