The first thing you notice about the K60s are the unusually stiff sidewall, which accomplishes two things: One, it makes them a bear to install, according to my mechanic, and two, it makes them extremely stable, even at lower pressures. I ran mine as soft as 20 psi off-road without any stability issues, which is important on a 525-pound, 120-hp dirt bike. The second thing you notice, on pavement at least, is how the front tire sings above 55 mph. It's never so loud that it can't be muted with earplugs, but it's strange if you've never experienced it before. That's the cost of an interrupted tread on hard surfaces.