Bicycle frames utilizing pressed bearing standards do not have any threads inside the bottom bracket shell. The bottom bracket is pressed directly into the frame. Using pressed in standards allows frame manufacturers greater flexibility in the frame design that many times offers greater stiffness and weight reductions, however many users are reporting creaking issues with these systems. The current pressed-bearing standards (and developed by) are: BB30 (Cannondale), PF30 (SRAM), BB90 & BB95 (Trek), BB86 & BB92 (Shimano), BB79 (Cervelo’s BBRight), and BB386EVO (FSA and BH bicycles). In BB30, BB90 & BB95 systems: the bearings are pressed directly into the frame. For PF30, BB86 & BB92, BB79, and BB386EVO; the bearing is housed in a nylon plastic cup that is pressed into the frame’s bottom bracket shell. Pressed in standards usually require two-piece cranksets where the spindle is attached to one of the crankarms. Due to fixed spindle length and diameter, crank sets designed for one pressed standard may not be compatible with another. For example, a crankset made specifically for BB30 will not fit in a BB86 bottom bracket and frame. There are other instances where adapters can be used to fit a crankset made for one standard into another. For example, a Shimano (two piece Hollowtech II 24mm OD spindle) road crankset can fit into a BB30 bottom bracket shell (42mm ID) using aftermarket adapters.