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Old 11-12-2020, 05:12 PM   #4
HDRDTD


 
Drives: 2013 Triple Black ZL1 Vert M6 ECF
Join Date: Mar 2011
Location: Trenton, Michigan
Posts: 7,046
On the 5th gen ZL1's, one is solid and smaller diameter, while the other is a larger diameter but hollow.
I don't remember the physics behind it, but they did it to reduce wheel hop.
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