Hi,
Check out FlixBus—I think the Paris-Marseille route allows bikes that aren’t disassembled. Sure, it’s slower than the train, but it’s direct!
With SNCF, anything’s possible except traveling with a bike
Since trains aren’t an option, some people do use long-distance coaches, but in this case, there won’t be enough space ("I want to bring my teens along with their cousins"), especially since FlixBus routes in France rarely have bike racks at the back—bikes have to go in the hold.
Honestly, foldable bikes (bought second-hand and resold after the trip) or the overnight Intercité train to Montpellier seem like better solutions.
