Originally Posted by
cyccommute
And, if you are trying to lose weight or build fitness, pushing knobbies on any surface does a better job of it in fewer miles than a road bike.
I agree
I feel that I'm burning way more calories than suggested in the calories computer by riding casually (13mph) for one hour per day. The amount of effort expended by riding a knobby-tired MTB at 13MPH feels so much greater with a 44T upfront seem so much greater than riding on a slick-tired trekking bike with 700c wheels and a 48T upfront.