Also why is cycling so far behind in some respects?
Le Tour de France was completed at a faster average speed on these bikes. *
The 2003 Trek 5900 was supposedly Armstrong's favorite frame, weighing in at just 980g. Further weight savings were provided by a prototype carbon fiber steerer tube (which never made it into production), then-prototype 10-speed Shimano Dura-Ace group and Bontrager Race XXX Lite wheels. Chris King also began its three-year sponsorship run with its ubiquitious NoThreadSet threadless headset.
In 2003, the UCI hadn't yet established its minimum weight requirement so teams and riders were still free to shave grams to their heart's content; Armstrong's bike was reported to be just 6.6kg (14.5lb).
Le Tour de France was completed at a faster average speed on these bikes. *
http://www.bikeradar.com/road/gear/article/tour-de-france-winning-bikes-34375/