Four rings? You mean two... The Zero-One's are the dual ring, and the single ringed tired are the Zero-One R's. The R's wear down a bit slower than the regular tires, and they provide more slip. Just be sure to add a little negative camber in the front to get some grip. Although I run ABS since it's cheap and easily attained where I live, I would run Zero-One R's in an instant if I could afford it.