He didn't really need a bike, but of course it was quite efficient to get around. But that was only the second reason

What he really needed was you on the passenger seat. He's liked you for practically the whole time he's known you, but he is absolutely terrified of getting so close to you. You've been to each other's houses and have even hugged before! hugging was a big step for him.

But the idea of him getting close to you could give him cardiac arrest, and the idea of you not liking it could kill him. But he craved your touch all the same.

On the bike, you would have to be close to him and it wouldn't even be weird cause it was a safety necessity! Besides, it's just testing the waters, if you never wanted to ride with him again then he could live. he'd cry.

But Dick needed to try it out first. "C'mon! I got you a helmet and gloves and I promise you'll be safe, all you gotta do is hold on." The ravenette gave you his biggest grin as he held the helmet out to you.