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Production EVs always have a gear reduction and a differential. So the Bolt has two different reductions to choose from with a computerized clutch instead of just the one. It's not like it has a five speed slush box. A starting gear and an everything else gear with a compound planetary gear set and a clutch instead of just a simple planetary gear that other EVs already have.
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Better performance and efficiency for a very minimal weight and cost gain.
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