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Message: <blockquote data-quote="FW_Z71Burb" data-source="post: 28016" data-attributes="member: 13704">well, according to O'Reilly, the rear factory rotors are already 13" diameter, where front is 12".the GMT900 upgrade is going to 13" rotors on front so if the rear already has 13", front 13" should also fit on the factory wheels...read that the rear brakes actually do more work on these than front's... so that kinda makes sense they would stick bigger on rear from the factory either way, with the help of yall and O'reilly, looks like I got her figured out.</blockquote>