You can use a different bike, but you need to meet a number of conditions

The best option is when you come across an enemy who also uses a bike while exploring the game world. Wait until he stops and parks his bike, then sneak up and steal this transport.

There is one limitation for this case. The game will not allow you to change your current bike to another one if it was damaged, for example, an NPC crashed into an obstacle while chasing you or you fired at his bike



Keep in mind that if you want to escape from bikers, it is much more profitable not to steal any of their bikes, but simply to damage them all, thereby sabotaging the opportunity to go somewhere. Yes, the above restriction also applies to NPCs if their motorcycles were parked and no one was on them at the time of the damage.

As for the bikes that are in the parking lots, in Days Gone, the main character can not use them, as well as the bikes that appear in all other cases.