The tires are Blizzak LM-25. And the wheel specs are 225/50R18. These tires are the same size all around. So the rears will sink in a bit. You can always use spacers to bring them back out. The reason why I did not get wider tires for the rear like the stock is because wider tires do not bite into the snow as well.
Pictures can be seen in my craigslist ad, which show the tire info and the amount of tread.
18 Inch Rims and Tires