Originally Posted by
raydog
Actually, I rode around Lake Tahoe on a 24 lb road bike then two days later on an older 32 lb mountain bike, about 76 miles for the route and there was a big difference. I just thought they were fun numbers, gosh, next time I post in this section I'll sure have my data together at a higher and less disputable level.
There are differences a lot more significant than weight between those two bikes. This is not to say weight isn't a factor, but tire rolling resistance makes a much bigger difference. On a flat course, with a steady pace, the effect of weight is close to negligible.