The body and front fork are hooked up to the same power supply located underneath the seat. I found some fairly lightweight power supplies that I am using for each wheel; they run off of two AAA batteries and are in a water-resistant housing.
To attach it to the frame I simply used thin plastic cable ties. The white translucent ones do a nice job of mounting the wire without blocking out the light. Around the tires I did the same thing; using cable ties I attached them around every other spoke. I used two ties on each spoke, one around the spoke an one around the wire to keep it running perpendicular to the spokes.
Overall it was a pretty simple project. As with any EL wire project the only difficult part is soldering the wire, but that really just takes a little bit of practice.
Also, it blinks, which is kinda cool.