I know that getting on a light bike makes me go much faster... and if doesn't seem to be the 5 lbs difference... or is it ? Is it just an illusion ? If I hung a 5lb weight on me and then got on a light bike would I feel the same as the heavy bike (mechanical smoothness of the more expensive bike aside) ?
Well-conducted tests have shown that it's not easy to feel an additional 5 lbs on a bike; but as we all know, it *is* easy to feel the difference between a high-quality bike and a lower-quality bike.
-- "Bicycling is a healthy and manly pursuit with much to recommend it, and, unlike other foolish crazes, it has not died out." -- The Daily Telegraph (1877)