Excellent point jimberg - Matching up 2 new Blizzaks with 2 older ones that worn to the point where they are no more effective than a regular set of all season tires really makes no sense and it would seem that the liability question would be very much alive and valid. Both of the tire dealers I checked before buying from Tire Rack would not sell me less than four of these for my vehicle - period. If you read the literature from Bridgestone on these tires they are pretty much to the point and state they should only be used in sets of 4. I wonder if Tire Rack would require some type of proof of mileage on the ones you now own, before they would sell you only two tires?
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