Brilliant route. Get well informed before you go. If you don"t have enough time you can take the bus all the way up to Reckong Peo (get your permit here) as the stretch along the Sutlej river is the least interesting part. Starting from the Kunzum Pass the "road" gets extremely bad, so make sure your bike is in shape (my screws kept coming out). Untill June the snow might block your way.