Absolutely stunning! Now, if they had synchronized their respective pedal stroke... The bicycle's frames are really identical but I notice that the derailleurs are different and the brake pads also. The woman's brake pads (CoolStops?) are coordinated with the frame color and her shirt - well done Lady!
As for changing the background, I like it as it is but maybe try to slightly lower the saturation of the brightest colors.
Bravo, perfectly timed.