Heya. Just wondering what's involved in swapping back and forth between wheelsets. I know racers do it fairly frequently. Front wheel, obviously check the brakes. But what about the rear? Does each rear wheel get its own cassette? If the cassettes are different sizes (e.g. 9 speed 12-25 and 9 speed 12-27), do you need to fully re-adjust the RD? And can it be done well without a repair stand?