Roll out of Châteaudun and let the ride unfold: past the castle of Villebeton, then along the L'Aigre and the Loir rivers before looping home. Of the 59.4 km, most runs unpaved, so expect a mixed-surface day on the way out and back. The route stays gentle, with just 149 m of climbing across the whole loop. Rivers, a castle and quiet lanes carry you from start to finish.