Just to give you a FLIP SIDE of that coin. I run 5.5gr Malossi rollers on the same scoot as shaka. I do want to try the Dr. Pulley sliders, because I here only Positive results w/ them. I just don't want to start tunning again. I'm pretty good w/ the rollers. I run about a year w/ them, and maybe there's better, but for now!