Originally Posted by
steveknight
if you want more of a workout without the weight go faster. this may be more benefit then hauling more weight. but you can get the same workout substituting speed verses weight.
I agree to a point. But what if your commute has lots of start and stop and doesn't allow enough long pulls? With high pressure tires and no load, I can barely get any work in for about half my commute. Lower pressure tires and stuff in the panniers (junk in the trunk?) definitely makes me work harder between stop signs than I'm able to otherwise.
(And yes, I am only pretending I stop at stop signs for the sake of the hypothetical.)