jack the more air you put in to a paddle tire, the more grip it has. it keeps the paddles from folding back. if the track is to hard , it will not let the paddles dig in especially with haulers . my rule of thumb is if you drive out on the track, and the paddles don't completely sink in to the ground, the track is to hard for paddles. if that is the case you may want to look in to studded tiers. look at the bikes at your track, that r pulling good 60ft times and see what they r using, and if they r paddles what kind . with a hard sandy dirt, i usually run 10 to 15 psi and if they still fold ,you may have to look at some stronger paddle's , like extremes they do not, fold as much .