The GR de Pays Coteaux du Layon et de la Loire is a stunning path along rivers, castles, hills. You will see and cross many vineyard. A few parts are wide and brand new, but most of it is single track. You will get through very unique villages. 

https://www.anjou-tourisme.com/fr/diffusio/randonnees/gr-de-pays-coteau…

Le Tour du Fronsadais 

Une typicité due à la composition organique des sols accentuée par le relief, offre aux vignobles du Fronsadais un terroir exceptionnel dont les appellations Fronsac, Canon-Fronsac, Bordeaux et Bordeaux supérieur peuvent être fières. Entre l’Isle et la Dordogne, sur les plateaux et les coteaux, il bénéficie d’un ensoleillement optimum pour des vins de qualité.

UN PEU D’HISTOIRE…

The route totals ~34 miles with 1500 feet of climbing and 7500 feet of descending, but is built with enough ups and downs and tight sections that little of that downhill comes very easily. Built as a 'downhill' mountain bike trail, it makes for a very interesting run from 10,700 feet down to 4,700 feet. Entirely singletrack or desert 'wash' until the final 2 miles on road into town. Aside from a few short sections, the entire trail feels very fluid for a running trail (much more cross country single track than true 'downhill trail').