I remember reading an article years ago on the best "training preparations" you could do, is to help your horse take on the world by building their confidence at home.
Each piece of my conversation with the once completely wild filly prepared her for her first bicycle ride. Teaching her to soften to pressure, follow a feel, follow pressure, try when unsure, be reasonable, adapt her energy, mentally think through things...
This was not a random "let's see what happens" the first time I ride a bike with her. Instead, I worked on building up the trust, offering support, and now with curiosity, she is interested in new things.
Forgive my goofiness, it'd been 20 years since I've been on a bike, and choosing a trick bike might not have been the smartest for my knees.
Is everything perfect in her behavior? No, but watch the changes she goes through in just one circle as she sorts out all is well.
And no... don't try this at home without ALL the tools in your communication box.