2 Tubes + 2 Tires = 4 things that can potentially go wrong at the track.

0 Tubes + 2 Tires = 2 things that can potentially go wrong at the track.

Rip a tube and you are done. Get a small hole in a tire - plug it and keep going.

No tubes = less rotating weight and less $ spent

Tubes = stiffer sidewall - but I can order tires with that already built in.