Get the Exotek tires/wheels, front = #2194 (red dot 38X medium), and the rear = # 2252 (white dot 22X carpet soft) for CRC black carpet. You will need to glue the sidewalls (front and rear), though how much depends on the grip level and size/speed of your local track. While the carpet may be the same as all other CRC black carpet tracks, depending on the types of cars and use level, the amount of grip will vary substantially.

The eXcelerate F1 rear tires are softer than the Exotek 22X tires. After a few hundred laps my eXcelerate rears developed a ring of death on the inside. These flexed and rolled so hard that I had to glue the entire rear side wall even though some said the rears would need no sidewall glue. The eXcelerate rear tires are probably best for smaller tracks, or newer carpet that's not grooved and tacky yet. The rear tires wear much faster than the Exotek rears, so keep an eye on them after you get a few hundred laps on them. The positive about the eXcelerate wheels/tires is that they were roughly 8g lighter per wheel/tire knocking just over 30g off the car.