Help! Headset bearings and Cad

How do I chose headset bearings for my bike.

Also what is the best way to model it for a carbon frame.

I can give more detail if that helps, Thanks Guys :heart:

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The two most common IS headtube standards:

IS42/IS52:

This standard seems pretty similar across all brands. I use First Components as a reference because they post their documentation.

I use the d40k on our bikes:

IS52/52 for internal routing.

IS52/52 is a bit more all over the place. There seem to be different standards for the depth of the cups. I think ENVE’s specification is the safe bet:

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Thanks man also the bikes on your profile are really sick

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