Adam indeed they do go SC1 SC2 SC3, but what Pirelli don't tell you as I was told by a tyre technician was there are several other codes which determine which variant they are
SC1........................................SC2.... ..............................SC3
^*******^ ^ ^ ^ ^ ^ ^ ^
This places them somewhere in between as I've tried to demonstrate above.... now enough of that scare mongering!
[Edited on 30-3-2005 by JPM]