Routing for Biking on Pavement

[AdaR]

Looking for help on planning my Frances Camino route, by bicycle, in September.
My son and his wife will be joining me in Pamplona, after bicycling through Italy and France this summer.
They have been sticking to paved roads and want to continue in that mode as neither of their bikes are suited for trail or off-road travel.
Any suggestions for loosely following the Camino while staying on pavement? I'm assuming that the waymarkers are strictly on trail, as intended for walking pilgrims.
Has anyone used any of the tracking and routing apps, such as Strava?

 

[spursfan]

This CSJ booklet covers both walking routes and cycling diversions
http://www.csj.org.uk/product/camino-frances/

There is also a separate pamphlet for cycling pilgrims

 

[AdaR]

Thank you Spursfan. I'll check it out.