@bostonYogaFan , I understand from your post you intend to cycle the Frances in several stages.
I would alos understand that, en route, each stage would be a seven days cycling, or less.
Firstly I would strongly caution you against cycling on many parts of the walking trail. Put simply many parts of the walking trail are not suited to cycles. Then add the pesky walkers ... Unisuitability for cycling comes in many forms. It may be the narrowness of the trail, hemmed in by vegetation or fencing. Or it might be a rocky (or whatever) uneveness that has walkers criss-crossing to to be safe.
And then there is the rule (in my country at least) of pedestrian priority on shared trails. That means cyclists have second (and slower) place in those awkward circumstances.
From my observation the parts unsuitable for cycling occured on just about every one of my stages. And in many cases the walking trail was alongside a road. So it is not the case that using a road proper would deprive you of any of the "magic" of the
Camino Frances.
For that reason and others, such as wanting a more consistent surface to walk on, I often took to the roads. From memory between the Franco - Spanish border and Galicia there are two main roads the Frances often follows. These are the N135 and the N120. And in Galicia the LU633 covers a significant part of the distance and is, also, often either the walking route itself or close to it.
And a joy for both on the way to Compostela when using a road is that walkers will be on the left and cyclists on the right: never the twain shall meet.
So,
@bostonYogaFan , kia kaha (take care, be strong, get going)