Hi Dave,
1. Minipins or any other astro tyre==Bow ties/crime fighters any small block
2. Anglespikes/grass tyre==Proline step ups
3. Kamikaze tyres, or a good worn grass/dirt tyre==Proline step pins/Revolver/bow ties/Crime fighters or Caliber
There is a fourth. Wet Astro==Angles glued aggressive. Thats the most pins in a row to the outer of a rim (glued wrong way around)
You can have a look here.
http://www.prolineracing.com/c-7-tires.aspx
Tim