The Kizer Slimline 2 allows for multiple rockering options:
Up to 58mm wheels, all rockered down.
60mm outside, rockered up, 56mm inside, rockered down
Up to 80mm outside rockered up. With 80mm wheels, grindwheels only fit in Frame size M & L (80mm wheels in size S frames are possible riding freestyle)
Depending on the skate, adjustments like cut-outs and recesses to the soulplate are necessary. The Slimline 2 allows the speed of 80mm wheels while still having a low profile frame with a low center of gravity.