To dream of a motorcycle represents independence and self-determination. You or someone else has the freedom to make choices and do things in their own way.
To dream of evil or bad people riding a motorcycle represents negative aspects of your personality that are free to do as they please. A sign of rebelliousness.
To dream of a red motorcycle represents the freedom to do what you want in a manner that is negative or excessive. Too much focus on the self, dishonest intentions, or an excess of materialism. You may have a lot of money or power and are insensitive to anything that gets in your way.