Originally Posted by
IBLUBYU
Sandy .... they're 2 different tires. The PS2s are considered "summer" tires, and would give no traction in slippery (wet) AND snowy conditions. The DWS (stands for "dry, wet, snow") are made with different configurations of the treads and "sipes" that provides better traction in all conditions. They are NOT considered "snow" tires, but are amongst the best "all-season" tires available. The "DWS" are indicators built into the center tread, that wear down as the tire wears, that will indicate whether or not the tire will perform as it should. If the "S" (snow) indicator is gone (its the first to go), then it will only perform well in the "D" (dry) and "W" (wet). Along with that, the composition of the rubber in the tires, are different also, so that they resist getting flat spots when parked in very cold weather. I'm pretty sure about this, but I'm sure others may chime in about them.
On a side note ... measurements of the depths of treads, are completely dependent on the competency of the person taking the measurement, and the accuracy of the instrument used. I Usually have measurements taken in the center tread, at 2 to 3 places around the tire. Just sayin .......