While searching my next holiday, I came across this: 3 guys who set the world record for cycling at the highest altitude - 7000m. They carried their bikes up a mountain in Western China called Mustagh Ata.
I am not sure if I would call this recreational cycling.
Check this out:
http://mtbike.mountainzone.com/2000/mustagh/html/index.html or http://www.jmilne.org/mntn/China2000/Ch2000b.html
I am not sure if I would call this recreational cycling.
Check this out:
http://mtbike.mountainzone.com/2000/mustagh/html/index.html or http://www.jmilne.org/mntn/China2000/Ch2000b.html