Camino routes based on ease of biking and guidebooks to go with them?

We have a copy of the translated yellow German guidebook which offer some cycling tips. It is by Joos and is called Outdoor The Way is the goal. I am sure there are others.

Ola,
I'm cycling the Camino Portuguese from Lisbon to Porto presently and using the Brierly guide. I would suggest coming out of Lisbon is okay but north of Santarem esp around Opcion it's hard going on a bike. Some of the green trails are very rough.

Appreciated the guide is written for walkers but I noticed some pilgrims using wheeled rucksacks (if that it the correct term) who would struggle on these green routes. Also on the road sections the margins are narrow and potholed.

The view above is my own and not to detract from the Brierly guide which is an excellent guidebook. I seem to be spending a lot of time on alternative navigation to mitigate some of these paths and tbh it's detracting from the enjoyment of the Camino experience.

However, the coastal route north of Porto to Vigo is very easy on a bike and can be easily navigated without a guide.

Hope that is of assistance.