Starting on the A81 at the bridge over the Forth, proceed North to Rob Roy roundabout and follow the A81 right towards Port of Menteith. Follow the A81 turning left towards Callander. In Callander take the left turn on the Invertrossachs unclassified road at the roundabout (14miles), follow this road bearing right over the bridge to join the A821 turning left at the T junction. Follow the A821 over the Dukes pass to finish at summit of the climb.