You don't even hear the KM2s under 45mph, they do make some noise over 50mph but not real loud. My ride is very smooth but that may be because I put on the Rancho 9000xl shocks set at 5. Only down side is they do run on the small side but they are pretty light for an MT. I think the 35x12.5x17 is only 66lbs, 10-15lbs lighter than some other MTs