Assertion: thunderbird's inch | /r/HasProperty | 439.4 mm
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text: The first generation of the model line to undergo downsizing, the 1980 Thunderbird shed 17.3 inches (439.4 mm) in length, 4.4 inches (111.8 mm) in width, and 5.6 inches (142.2 mm) in wheelbase from its 1979 predecessor; depending on powertrain, the Thunderbird was up to 1,400 pounds (635 kg) lighter.