For the following routes I have put together additional infos:

 

Iran: [Internal]Dash-e Lüt
Tadjikistan: [Internal]Pamir Highway
Tibet: 

[Internal]Xinjiang - Tibet Hwy.

[Internal]Guge Kingdom

[Internal]Northern loop

[Internal]Shigatse - Lhasa

[Internal]Lhasa - Dali

 

 

Cycling across the Dasht-e Lut
Koy Tezek Pass 4272m
reaching Everest base camp
in the subtropical virgin forest, near Tangme
Fighting the elements at Ngajuk La