I brought my bike as a third piece of luggage in an oversized Giant Bicycles branded cardboard box, as i I discovered my second hand bike case bought online didnt fit..the day before my flight. Pushing a cart with two large suitcases and a carryon, and dragging the big bike box, I just got a glance going through customs. This was in 2016
As a tourist you can bring sports equipment duty free, with the intention of taking it back home.