Originally Posted by
roberino
Or is it more complex than that?
It appears that you can check it for free as part of your baggage allowance - if you have a baggage allowance as part of the ticket, and if the bike and bike case don't exceed the weight limit of your baggage allowance.
https://www.austrian.com/gb/en/sports-baggage
You have to book it in advance anyway, so I would advise you to ring Austrian Airlines to check.
Also - beware if you are expecting to carry your bike on the basis of having a "plus one" baggage allowance as *G; I have my doubts whether that would work, but rather that you need a ticket with an actual baggage allowance included.