I did the
Camino Frances by bicycle from Pamplona to Santiago in 2022. You didn’t specify, but I assume that’s the route you’re talking about?
As I recall there were only a few difficult spots after Pamplona: downhill from the Alta de Perdon, up to O Ceibrero, and downhill to Molinaseca. Probably before Pamplona it would just be into Zubiri. You could do the route Napoleon, although it would be exhausting.
I had purchased the Cicerone guide for bicycling the Frances. It did tell you the two routes on the camino, the shared walking/bicycle route and the road bicycle route. It also told you a few spots where it would be difficult to bicycle on the walking trail.
But I did not find it that valuable. Unless they published a more recent addition then the one I bought in 2022, it was very outdated and their route directions and maps were difficult to follow.
I seem to recall that the
wise pilgrim app also mentioned where it was difficult to bicycle on the shared trails. I ended up just using WP for directions.
The one thing extra Cicerone did have was a listing of bike shops, although I never used that so I don’t know. You could probably find bicycle stores quite easily on Google maps.
And again, I agree about mapy.cz. Best mapping app (I did not know about it in 2022). Much clearer and easier to read. They have a toggle for “outdoor” overlays which shows walking and biking trails, and if you zoom in enough you get elevation as well.
You can download country maps for free so you can use it off-line.