We have recently returned from a trip into Tibet (as far as Lhasa) by bike, starting and finishing in Nepal. We were hoping to keep going into China but were told there was no way we could get through and leave by another boarder crossing.
We did all our organisation through Sacred Summits in Kathmandu. We had to hire a guide and car, but they generally left us to ourselves except for at the checkposts.
It works out pretty expensive, but we thought it was worth it. A mind-blowing, awe inspiring ride - amazing scenery, fantastic people, challenging roads!
Anyone wanting to know more can e-mail us direct