A great route to avoid the tarmac route to/from Theth. There is about 50km of rough stone road used only by a few locals and the odd tourist. I under-estimated the time it would take to travel this route. Riding a hardtail MTB (with luggage) the terrain was at times very challenging and even travelling downhill progress was at times slow. A MTB is definitely the best choice of bike for this road. You'd get there eventually on a gravel bike but it would be very slow going and not much fun.