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1978 and '79 930s came with 16X7 and 16X8 wheels, with 205/55 tires in the front and 225/50 in the back. These were the same tire sizes as on a contemporary Corvette, and my understanding is that these were the biggest tires available. The 76 and 77 models' wheels were even smaller: 15X7 and 15X8. Keep in mind that tire compounds and tire and tread design have come a long way in the past 45+ years.
Poor grip + rapid boost onset + steering input = unintended agricultural exploration
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