Team MTBNJ Halter's
The deal with PDX is the more you lean them into a corner the more they grip. Between the center block of "Y" treads and the block of "Y" treads on the shoulder there aint' much (see below). Get the bike leaned over more. You need to drive them hard otherwise they will squirm on you. Also, the knobs are tall and thin so they can feel a bit squirmy on hardpack or pavement.