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Compact "Donut" Spare

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Compact
Sean Phillips
A compact, or “donut” spare is the most common option. A compact spare is generally a narrow steel rim, sized smaller and thinner than standard wheels to save weight and cost, and carrying a higher-ratio tire to make up the difference. For all that, compact spares are not nearly as dinky as they look. No car manufacturer really wants to have a donut fail on somebody, so they are generally somewhat overengineered.

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