Arrive at Sivry-Courtry by first skirting the sports ground, then turning left onto the road at the entrance to the small wood. Arrive at Rue de la Libération. Turn right to immediately arrive at a traffic light. Cross the road and bear left to continue a few metres along the D605 (you’re protected from the main traffic flow by the traffic light). Immediately turn right onto Rue de l’Église. At the end of this road, head left in the direction of Bois-le-Roi and Chartrettes. Bike along the tarred secondary road. At the intersection after a copse, turn right onto the D115 towards Bois-le-Roi and Chartrettes. Continue along this road for 5 km to reach Chartrettes.