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Q: Why do off-road packages use 18 inch wheels instead of 20s?

More sidewall. A 255/55R18 carries roughly 5.5 inches of sidewall, an inch or more of extra rubber compared with factory Model Y fitments. That rubber is the suspension before the suspension: it absorbs impacts, resists pinch flats and lets you drop pressure for traction off pavement. The 18×9 wheel keeps the tire’s shape stable while the sidewall does its work.

Tesla Model S

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For the do it yourselfer or trained mechanic, our in-depth installation guides provide step by step detailed instructions on fitting your Tesla with Unplugged Performance Parts.
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Tesla Model S

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