It's 2.5 lbs you don't have to move. Percpetions of any difference would have multiple factors involved. For example what percentage is 2.5 lbs. of weight when considering the total weight of rider and bike? If the rider and bike weight 270 lbs. I'd venture that 2.5 lbs. doesn't make much difference. If however, the combined weight was 160 lbs. it might make a very big difference.