you want the race railz dood. frame sliders are a waste of money and a garbage. ive ran the north run a gazzillion times and everytime i see someone go down thier sliders did not slide instead they break off and snap like a twig. race railz have the mushroom tip to insure it slides no matter what and since the railz are locked into both motor mounts you dont have to worry about anything braking off. plus when im uncomfortable after long rides i can sit up and put my feet on them while im riding lol.