The Specialized Mindset was a headset that Specialized used in the late 2000s through early 2010s on some of their road and cross bikes. The Mindset is already designed to accept a regular IS41/28.6 | IS41/30 Headset. You will need to remove the cage bearing cups and use anywhere from 1.5- 4mm of shim spacers to prevent the bearing cover from bottoming out on the frame. You can learn more about shim spacers in our article How and when to use Shim Spacers for headsets (Needs Hyperlink when posted)