the difference from the pvm frontwheel is very noticable. The rear not, ok it loweres the whole bike weight, but I didn't notice. But the wheels isn't the only thing I changed on the geometry. What a light frontwheel contributes, is that at speed, > 60 mph, it's much easier to correct/change the curve you make in corners. I had to get used to it, becuase you only have to think thtat way, and there it goes. Before you must think: ok now we are going to make an adjustment, lets go, and push the bike.