Originally Posted by Duke of Kent
Unless its from the wheels, a pound is a pound. Even from the wheels, it's just a little bit easier to accelerate, and nothing more.
Whoever told you that is misinformed on a little thing called physics. You still have to accelerate and lift the entire system when climbing.
Regardless, after swapping my 20.5 steel bike for a 15.6 lb CF model this year I would disagree vehemently, especially when rocking the bike back and forth over flat to rolling terrain. I climb better on the CF despite the fact I am actually 15 lbs heavier than when I had the steel bike.
Bikes are not only ridden uphill and somehow a 180 lb person carrying a 40 lb rucksack doesn't quite seem the same as a 200 lb person carrying a 20 lb rucksack...to make an intentionally overly extreme example.