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For the majority of bikes, you will have to remove the pedals, seat, both wheels, and disconnect the handlebar assembly. At that point, you can place the bike in the B&W International Bike Box II and use the provided pads and Velcro straps to secure the bike in place.
The B&W International Bike Box II can fit a frame size of 62cm. So your Freedom X bike should fit. You will have to remove the seat, pedals, and handlebars in order to fit the bike.
The bike.box II comes with everything you need to securely transport every part of your bike. Wheels are securely packed in two medium wheel bags and the built-in frame suspension keeps the frame stable.
Please email us at techsales@opticsplanet.com for further assistance.
Unfortunately you will have to confirm this with the airline. Some do not include wheels in measurement, for example, while others have different thresholds before you start accruing additional charges. Most have a threshold of 62" in total dimensions, so this would likely qualify.
It should if with the wheels off the frame will fit in the internal dimensions of 45.3" x 31.9" x 11".
The appropriate case depends not only on the frame size, but the suspension, as well.
I would recommend downloading the current catalog at https://www.b-w-international.com/wp-content/uploads/2019/01/bike.cases_012019_web.pdf to ensure compatibility with your mountain bike.
When you open the PDF, use the "Find" feature to search for the word "mountain", and you will see the fit charts displayed.
Mark H.