I do believe in magic, and I feel it whenever I'm in the saddle. No matter the bike. But as an answer to the op, I weigh in at around 175-180. I have noticed that my city bike, ('93 Giant Prodigy) when heavily loaded with groceries, rides like it's floating on air. So in this case, the weight is what makes the difference. Like a light weight pickup rides when fully loaded. Same kind of feeling.