Powell G-Slides Wheels Set Red 59mm/85a Super fast, incredibly durable, and they slide. SSF is a new paradigm, opening up even more of our concrete and asphalt cityscapes, roads, and hills to skating. The new G-Slides were built from the ground up to improve roll speed, slide-ability and durability. They have a low profile and feel at home on any type of deck set-up. Push, slap, grind, bomb and slide the hell out of them. Yes, they slide.