Loop from the Center of Montpellier

Get out of the city to the D21, and take the first right after going under the A9. Go through Lattes, Maurin and Puech Garou on the d 185. Follow that to the D 613, and on to the D 114. Go over the hill and to Mireval, and follow the D116 back through Villenueve-Les Maguelone, then work your  way back the way you came, into Montpellier. The route is a little longer than that indicated, but everything is pretty flat, so about 2:15 hr. should do it.