I'm planing on riding most of the route as well. I would like to start in Paris since biking the route gives so much more time to stay places and experience the towns. This interests me much more than endless walking, though I'm sure that is a special experience in and of itself.
So I don't have any advice since I haven't done it yet, but I have some thoughts. I am leaning towards a mountain bike so I can ride off road and so I don't have to worry about difficult roads. I'm not in a big rush, and since there are places to stop within a days walk all along the route, if I don't want to stay somewhere I can easily bike on to the next place. Walking an additional 20km would be much more difficult.
I have traveled quite a bit, and I have done some long bike trips, and traveling light should prove virtuous on the Camino as well as anywhere. I thought for a while I might get a bike in France, but I think it will be easier to get one here, prep it up, and put it in a box for the airplane to Paris. I think there will be a fee, but it shouldn't be too exorbenent. I'm also thinking that I won't get anything very expensive so I don't have to worry too much in case I wreck it or it gets stolen.
As for gear, I plan on having pannier style saddle bags, and maybe a bag on the front as well. No bike shoes for me, I don't like them. A good pair of boots will work well to keep my foot flat to reduce fatigue, and they will serve me walking over any terrain. I will carry Tevas with me so I can occasionally air them out and get some relief.
Of course a basic repair kit is essential, as well as putting in some time practicing important repair jobs from the comfort of home. As for food, I don't plan on carrying more than a day's worth at any given time. I would prefer to get my food in town. For me, it's important to have some real adventure, and sometimes that includes going hungry. Of course I will always have snacks on hand.
I was thinking about getting a serious water filter so I can drink any water along the route. That bottle and 1 or 2 empty nalgene bottles should be plenty. You don't want to get weighed down carrying tons of water. There is a nice bottle here:
http://www.katadyn.ch/site/us/home/outd ... am_bottle/
You could probably survive a drink from the most virulent African puddle with that baby.