I agree with you. I called into the Ryanair office at Billund to ask if I could take my motorcycle helmet on as hand luggage as it would not fit into the measuring cage. They had no idea. I just had to try and get it through. As it was, it was not a problem. I would not risk taking my bike through in a suitcase. What do you do if they refuse to let it through? You are now stuck at the airport without a box and your plane is due to leave shortly. You either leave your bike or miss the flight. It is not worth chancing it for a few euros. I would rather pay the extra and send it in a bike box.