I cycled this tour across the second highest pass of the world in 1996.
We flew to Dehli, took a bus to Mandi/Manali and cyled in 8 days to Leh. From there we took a flight back to Dehli.
We had several additional days for acclimatizing to the altitude and getting over the flue (Dehli 3, Manali 3, Keylong 1, Leh 2).
A hand-marked GPS-track of the tour can be downloaded at:
www.bikemap.de/region/Manali-Leh and especially at www.bikemap.de/route/7383.
This track was not saved by an electronic device but only drawn by me using a Google-Map. So please be aware that there might be mistakes (thanks for telling me!). I estimate the precision of my trac of +/- 300 Meter.