In general (not SC specific) I've used Tri Bike Transport service a few times in the last decade, not cheap but usually quite convenient.
I also used the Bike Box Alan Easy Fit - with my Gen 2 SC medium and my aerobar setup, I could leave the front end alone. Just had to remove pedals and wheels. Box is huge (quite wide)
For the Gen 3 SC, travelling in a traditional box, look 2/3 down this page from Trek for how to remove the handlebar if needed...
https://www.trekbikes.com/au/en_AU/speed-concept-fit-travel/
Hope this helps!
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T. Guertin / Spocket
I also used the Bike Box Alan Easy Fit - with my Gen 2 SC medium and my aerobar setup, I could leave the front end alone. Just had to remove pedals and wheels. Box is huge (quite wide)
For the Gen 3 SC, travelling in a traditional box, look 2/3 down this page from Trek for how to remove the handlebar if needed...
https://www.trekbikes.com/au/en_AU/speed-concept-fit-travel/
Hope this helps!
---------------------------------
T. Guertin / Spocket