I had PS860's on the car and had good use out of them. Did not notice any tread noise. This time I put PS850's on the front and they sing like snow tires. Will need to replace back tires also, so I'll move the 850's to the rear and put something with less tread noise on the front.

My question is -- where would I find a tire noise rating?

Looking at the treads on each, does it look like the 850's would be noisier? I don't want to put 860's on and find out they are just as noisy.
Primewell PS830/850 $55
Specs:
http://www.firestonecompleteautocare...well/PS830850/
Tread:
http://www.firestonecompleteautocare...0/PS830850.png


Primewell PS860 $65
Specs:
http://www.firestonecompleteautocare...imewell/PS860/
Tread:
http://www.firestonecompleteautocare...l-60/PS860.png