As requested, here is a classic water crossing on G219 (Tibet to Xinjiang). At 4,700m, the river water was extremely cold. I went through with my little 250 but the heavier 640 stalled midway and the rider was struggling to keep the bike upright (current is a bit strong). He screamed for help but I can't resist to go dig the camera out to take a shoot before jumping into the freezing water to fish his bike out. He managed to keep his Notebook and camera dry. :RE
on this seven day trip, we had crossed two big mountains and got lost once. Forced to camp at 3800m at midnight. When we woke up in the cloud, it's unbelievably bueautiful.