I have a 1985 Ross road bike that's a real tank -- 38 pounds ready to roll. I also have a 1994 aluminum Trek 1400 that weighs in at 22 pounds. My theory is, the heavier bike gives a better workout, especially in my area where the hills are more plentiful than the flats. The heavier bike is also faster on the downhills. I can attain 44 mph on the Ross; 40 with the Trek. Has any other senior cyclist found this to be true?