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Old 06-30-2018, 04:42 PM
  #12  
bjm9818
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Join Date: May 2008
Location: Philadelphia
Posts: 5,072
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I’m guessing the ribs provide extra structural support for a thinner product. They can use less material vs a smooth fender.

One of my aluminum roll forming machines makes a small rib on the rear of the product. Without this tiny rib the product is flimsy as hell. With it it’s much more stable.

All to save a few cents
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