Everything is a system, bigger tires do not nesessarily cause under or oversteer. In fact, adding tire can help to stabalize a chassis that is otherwise not handling as desired. Throwing some 315's on the front of a stock 30+ musclecar is going to cause as many issues as the 7X14 bias plys.
In closing, tires do not make the suspension but are commonly the weakest link when redesigning/upgrading.
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Dennis
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