Yea, outdoors is better with rubber. Sorex 36 tires will typically work OK on the MARCCA track and last for a bit. You can try the Take Off CS27 pre-mounts but on the hotter days, they will probably wear out too quickly.

Outdoors the motor rule is typically 19T or Mod -- since the track is so big. I would guess they would do an Open class since people could run brushless then if they wanted. But, it's not up to me any more.