I 've been building up my bike and upgrading bits as I went along. I finally decided to mod the headtube on my 07 S-Works SJ FSR so that it'll work with a tapered fork since it was limiting my choices on the forks available these days.
Started out with this (uses a standard straight steerer fork, with a Specialized Mindset headset)
Removed the bottom Mindset HS bearing, and enlarged the angled headtube bearing seat to so that the fork could fit in the bottom. Went off to design and make a headset adaptor so I could fit a IS52 lower bearing at the bottom.
Installed the headset and bearing into my frame (press fit and also bonded in place to the existing headtube with JB Weld).
Tested it out to see if it works properly
Took everything apart, sanded down the gel coat of the frame to the bare carbon fiber.
Laid up a mix of 12K linear tow and 2x2 twill, using filament winding technique. Wrapped up for compression and let it cure overnight
Cured in the morning
Sanded it down
Applied a couple resin topcoats
Two rubbing compounds and UV wax later....
Hope this gives you guys ideas on what you can get away with for carbon frames.
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Thread: DIY Tapered Headtube Mod Project