andyo, i'm running them on a 1990 MC21 SP. I purchased them from Motorcycle Power House. These tires were difficult to find in the 110/150 setup, so I bought two sets. Both are SC1 compounds. My buddy runs a new CBR 250 and has heard rave reviews about the new SET DUNLOP UNBEATEN-02's. I personally don't have any experience with these. They can be had for cheaper than the Supercorsa's though. Here is a link.

http://stores.racetireservice.com/-strse-33/FRONT-REAR-NINJA-250/Detail.bok