The Dayton Daytona ZR is no longer made. The Fuzion ZRi is the same carcass with a slightly different tread pattern (and maybe slightly upgraded rubber). They just made a new brand to sell the tire to the import tuner crowd.

-Philip Maynard '95 Contour [71 STS | Track Whore] '97 Miata [71 ES | Boulevard Pimp] 2006 autocross results