The Bolaven Plateau in Southern Laos is an excellent destination for cyclists. 1300m up means cooler riding and it starts with a 50km continuous uphill. That is rewarded with numerous waterfalls that are absolutely breaktaking.
We did it on a Bike Friday Expedition, Dahon Speed 8 (modified to 16), Aeon entry level bike with SRAM 24 speed and a road bike.
Read more about it here... Hope you enjoy it.