Southeast of Zurich near Chur, the Graubünden Bike route #90 is a multi-stage loop through the canton of Graubünden. This 375km route is typically divided into an eight to eleven day bikepacking trek. There are 49km of singletrack and 200km of doubletrack traversing thirteen high passes for a total of 14,000m of climbing. The main passes include Tomülpass, Alp Nova, Scalettapass, Glaspass, Kunkelspass, Valzeina, and Durannapass. The best time of year for mountain biking the high-alpine Graubünden Bike 90 is July through September, but the weather can be unpredictable anytime at the passes so be prepared. In addition to the cool weather at the passes, you can also expect very hot, humid weather along the valley floors. While the loop can be ridden in either direction, it is recommended to bike it clockwise.
There are a few companies that provide guided tours, self-guided tours and luggage transport, such as Bike Explorer. They can also help arrange hotel reservations. While Graubünden Bike 90 passes through several charming villages with nice hotels, there are several alpine huts available for lodging. The more popular villages include Chur, Lenzerheide, Vals, Lumbrein, Obersaxen, Laax and Davos.
Overall, Graubünden Bike 90 is the 10th most popular mountain bike trail of all 31 mountain biking rides in Switzerland.