if you can't do tires on all 4 corners, the new rubber should always go on the rear. i don't think it has been covered here yet but it comes down to most(not all) drivers ability. most people can recover more easily from under steer than over steer. abs braking helps out a lot in emergency braking when under steer can occur. in an over steer situation, people tend to panic, over correct and lose control completely. the better gripping tires on the rear obviously increase the rear grip and hopefully limit over steer.
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