As you've probably gathered, Swebus is the main bus company.
From their FAQ (in Swedish), on bringing a bike with you:
Originally Posted by Swebus FAQ
Bring your bike when you are traveling!
For those of you who want to continue the journey on two wheels when you step off the bus, do not hesitate to bring your bicycle. You buy the bicycle enhancement to your ticket for 99 SEK. We have room for three bikes on each trip.
To ensure that the bicycle will not damage your fellow passengers' luggage, it is important that it is properly packaged.
Do this:
Alternative 1:
- Pack your bike in a bike bag according to the instructions included with the bag.
Alternative 2:
- Rotate the handlebar a quarter turn.
- Remove the pedals and wheels.
- Wrap/cover your bike with, e.g. bubble wrap or corrugated cardboard and pack it in cardboard box or sturdy bag or sack.
We reserve the right to refuse to take the bike if it could damage other baggage.
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Ragnar