You can reach Rosswald comfortably by cable car from Ried-Brig. The mountain bike trail starts directly at the upper station. Turn right onto the gravel road leading downhill. After 200 metres, turn right and follow the trail until you reach the tarred road at Resti, which you cross and continue following the trail.
This mountain bike route takes you back to the bottom Rosswald cable car station, which will take you back up the mountain for a second lap, should you so wish.
Together with the Gantertal Trail, this varied trail, offers a successful day out mountain biking at Rosswald.