Hopefully this isn't too serious an answer for you....

Your post actually describes what your dreams are about:
there is some part of your life in which you feel you do not have control.
Your dreams feature bikes because your subconscious is trying to speak to you in a language you understand: bikes!
Something in your world is out of balance. Personally, I think your bike is somehow the answer.

Hugs and butterflies,
~T~