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Old 08-18-2013, 12:19 PM   #26 (permalink)
gone-ot walking...
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Dust brake shields mount behind the wheel, between the rim and the brake hub; whereas wheel covers mount on the outside of the wheel, in the actual air slip stream. The dust shield will mitigate some of the turbulence within the wheel well, but is not anywhere as effective upon the air slip stream that's passing over the outside of the wheel assembly as a smooth wheel cover.
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