Cycle route

They are about the same but you can find some very good bicycle guides which layout the alternative routes on paved roads. If you walked it you know there are some place you'd rather not ride.

Hola @scottTreker about the best is one (that as far as I know) is only published in French (do a google search); the other is the Michelin Guide. This second one is generally a walking guide but as it list most of the route names/numbers for local roads adjacent to the Camino you can do a google map search for alternate routes. You might also have a look at the Confraternity of St James (CSJ) a UK based camino group who did have a comprehensive cycle guide. But I think it is now only available in e_book format. Hope this helps.