Our initial plan was to ride up the "Grimselpass" from Meiringen then the "Furkapass" the other way as we did last September. Then down to Andermatt and from there ride the Sustenpass back to Meiringen. This would've been a loop with around 120 kilometers and almost 4000 meters of elevation. We thought of maybe doing it in two days tho. But unfortunatily the weather wasn't all too stabile and we didn't have that much time either. So we decided to just ride up the Sustenpass as this one was completly new to us and the Grimselpass we've reached from the other side the year before already. Considering the gradient this climb is way more mellow than the Große Scheidegg. In the first half or more you are basicly climbing on curvy roads through the woods until you reach the treeline and you find yourself in that stunning high alpine scenery with the glacier to your side. The road runs over a few bridges and through several tunnels. There is even a waterfall running down over one of the tunnels. We made the mistake of not bringing our lights with us, but would difinitly recommend to put front and rear lights onto your bike when riding this road even at daytime because in the tunnels you see basicaly nothing and it's also hard for the other roadusers to see you. As we reached the top of the pass we put our jackets on and turned back down towards Meiringen. This decent compared to the one at Große Scheidegg felt like paradise with it's long ramps and not to tight curves. So perfect to go full gas. If you would decend down to the other side to "Wassen" and then ride towards "Hospental" via "Andermatt" for example then you could do parts of our route from september 2019, and ride the "Furkapass", then the "Grimselpass" and decend back down to Meiringen. So there is plenty of options for multiple pass routes around that area. Here is our route if you like to check it out.