Originally Posted by sstorkel

Weight always matters and it matters especially when you're working near your personal limits. Think about Olympic weight-lifting, where weight differences as small as a pound can make the difference between completing a lift and failing. If you can barely managed to get a 50lb bike up and over that 10-mile long, 5% grade then adding another 13lbs to the package may increase your ride time in a very non-linear manner (e.g. because you have to stop in the middle of the climb and rest)...