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Originally Posted by vicfalc09
1) What is this option: "ZTK Cooling and HP Tire Package"?
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That's your new "track pack". It includes better cooling for the track (we do not know exactly as nothing has been fully published) and Michelin Pilot Sport 4S tires. The mobility kit is a portable inflator with some goo in it in case you get a flat since the tires are non-runflat.
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2) Why do some of the wheel configurations have the front and rear wheel sizes different?
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BMW usually does this when they offer the choice between all season and summer tires on a car. For the all seasons, they assume the customer isn't opting for max grip and do a square setup. For the summer tires, they put the handling optimized staggered width setup. It was the same way for the F30.