If you look at the bike and speeder models, the official ones are numbered either 7 or 8. These are the assault squads in a battle company. In the backstory, the assault marines of the 7th and 8th squads can use bikes and speeders. That's why those models have the fast attack symbol on them, that and because they fill a fast attack slot in the game.
The entire 6th company is made up of reserve tactical squads. The entire 6th company can also be deployed on bikes. That's in the backstory.
Similarly the entire 7th company is made up of tactical squads. They can all be deployed using land speeders.
So to answer your question, it depends on the unit they are from which is what I think you had decided yourself.
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