World's Lightest Road Bike at 7.6 lbs. (3,451 grams)
World's Lightest Full Suspension MTB at 14.9 lbs (6,760 grams)
Test data indicates that the combined weight of the cyclist and the bicycle greatly impacts the speed during climbs (http://www.analyticcycling.com/ForcesLessWeight_Page.html)
I use the following sources for information on lightweight bicycles, parts and components:
I would welcome comments and additional information regarding lightweight bicycles and lightweight bicycle parts.
If anyone is interested in getting details on the world record bike please leave me a comment.