Walk out on it with rubber sole shoe push down with front pad of your foot and twist back and forth and feel how much resistance there is, is the best way, if it feels real slippery not much the more resisatance the more grip track has. If while karts are out on track and tires are picking up dirt not racing clean there's not much grip either, If dry and you see dust rolling across track surface not much grip.
when your talking track I'd think grip, when your talking tire I'd think bite, but that just me maybe.