huge difference, the old setup was about 65lbs per wheel with a tire mounted on them. These are about 30-35lbs a piece with a tire on them. Also they required little to no wheel weight to be properly balanced where as the others were rediculous. Also, after seeing on ccw’s website of what these wheels look like on a cobra I had to do it, I like them so much more than the fr500’s, especially when they’re spinning