As far as Black, Yellow, etc. compounds....They are what I consider goofy tires
. Goofy tires work once in a while under goofy conditions. Running goofy tires at club races is usually a great way to slow yourself down. The reason you can't buy goofy tires is that they are only made for and brought to huge races like Cleveland, the Snowbrids, etc....just in case goofy conditions
pop up.
If you run 1/12th on carpet you run should Purple fronts and Gray Rears or Double Pink Jaco Wraps/TRC Wraps/CRC Pro Cuts front and rear. These are normal tires and work best 99.99% of the time.