Unfortunately you can't compare snowboards with bikes
All airlines agree to fly snowboards and skis as it is a significant part of their winter business. The same goes for golf clubs.
However, bikes, surfboards, kayaks and anything else fall outside the 'norm' and pretty much always incur an extra charge ( unless you are a significantly skilled blagger....I once had some BBC Branded Box tape and that got me through many an airport problem! )
Worth checking with your airline though, easyjet have been pretty good flying bikes out to Europe, but times they are a changing ( just look at the problems flying with surfboards and BA )... be prepared for lots of huffing and puffing!
Tim S