I just bought my second set of Blizzaks from Tire Rack to put on my minivan. My first set were installed on a 2wd Ranger pickup. The traction capabilities of these tires when running in the slippery stuff is amazing - you have to drive on them to appreciate how good they are. Through experience, I can understand the 4 tire policy as no matter what type/brand tire you would put on the vehicle to compliment the Blizzaks they would not have the traction capability to match up and this could easily cause a problem. For what its worth I checked two local tire chains before buying this set and besides being over 125.00 higher in cost, they also would only sell them in sets of four as Bridgestone recommends. These tire dealers are (justifiabley so) covering their backsides.
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