@Marilyn G , based on my experience I would commend and then add to the notes
@davebugg has penned above.
Many of the sections from Le Puy-en-Velay, Haute-Loire to Santiago de Compstela are indeed sufficiently wide with adequate surfaces to be easily shared by walkers and cyclists.
Equally many sections aong that 1,600 km route are just not suitable as a shared path. The impediments include:
- bridges less than 0.5 metres wide with sharp approaches
- narrow rutted paths
- smooth uneven natural stone surfaces
- rubble strewn steep descents
The issue is these are not sign posted ahead and are in the middle of paths that may begin in a promising way. A case in point is the path from Hontanas to Catrojeriz. This is literally a sheep / goat track along the hill side. But you dont know this as you start.
My strong advice is ride on a road. In Spain:
N135 from Valcarlos to Pamplona
N120 from Logrono to Astorga
There are many regional / provincial options to cover the "gaps"
These are in reasonable proximity to the walkers route. And in many cases these roads would have been the route pilgrims walked before the roads took over. And in nearly all cases where those two roads do not immediately bypass a "camino" town with food or accomodation there is a link road.
In my view it is the journey that matters and what you hope to achieve. Annoying the great majority of walkers you pass, again in my view, is not an achievement to be proud of.
Having said that, I do wish my cycling skills were as they were nearly 60 years ago so I could have a more flexible pilgrimage. Especially on routes such as from Canterbury to Rome. And I was somewhat envious of the several cyclists I encountered on the LU633 west of Sarria as all pulled up the various hills in that region.
It behoves me,
@Marilyn G , to say kia kaha (take care, be strong, get going)