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      08-28-2012, 11:21 AM   #3
Gary@TireRack
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Drives: Formerly 1995 M3
Join Date: Oct 2006
Location: South Bend, IN, Tire Rack HQ

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Both have their advantages and disadvantages. While polycarbonate may get too hot during track use and can get damaged that way (not common), they do not corrode and stick to the hub like metal rings can do in some circumstances.
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Gary
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