Interesting point about slowing down to compensate for the extra load. So you don't get the benefit of all that extra weight. The extra weight is definitly putting more stress on your body.

Years ago my father made an interesting comment to me. Had to do with bike racing in the early years of Olympic. He said, "When they still had rickshaws, bike pedalling kind (talking about 1910ish...) and the modern Olympic was still in infancy, Japan sent a team of these riders. They figured because they were pulling two or more people on these "bikes" they should really fly with just themselves. Needless to say, it didn't work out that way."

When you are pulling the heavier load, I think your body mechanic is different than if you were "pulling" a lighter load. So not sure except for Bicilista's comment and her husband.

I've wondered about training on a "heavy bike" with fat tires with big knobbies to increase the rolling resistance. But all the annecdotal comments points to "we adjust our workout to compensate for the extra load. Thus you don't see any benefits"

Can someone buy me a Ti frame bike that weighs less than 15 pounds ? pretty please wih sugar on top