I am a new cyclist and have a few sets of slick tires that I have picked up however I am wondering if they are safe for wet weather. I know many people will say that grip has nothing todo with tread on a road even when wet but what about road grime and other junk on the street. i.e. is it silly to put slick tires on a winter commuter (I don't mind spray from the tire, also there is usually no ice or snow where I am from - Portland) .