BB30 cups typically don't exist - the BB30 bearings press directly into an oversize shell in the frame. The only other type of BB30 cups are adaptors that allow the use of non-BB30 cranks like Shimano Hollowtech or Campagnolo Ultratorque to be used with a frame designed for BB30. Finally, there is no adaptor available to allow a BB30 crank to be used with a conventional threaded BB - they're simply incompatible. The only 30mm axle crank that can be fitted to a conventional BB frame is the Rotor (but it's a proprietary 30mm design, not BB30) Hope this helps
