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Specialized's official headset for it is the Mindset, but I think certain FSA bearings will drop in, mine has an FSA top cap and cartridge bearings, certainly. As for clearance, I can measure the frame later, but I only personally have 22/23c tubs to test fit, aside from my gf's 32c touring wheelset. Might be able to borrow a friend's Ksyrium's with 28c Paselas. I've also got an aftermarket LOOK HSC fork, not the original. Maybe @Thrasher can help you out there.
Just be wary of corrosion if you use it over winter, it's very thin tubing
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Defintely a normal cartridge bearing headset will fit, incidentally been discuss recently on the forum too.
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No need to be borrowing wheels, a pic or idea of clearance with the 23c would also give me a good enough idea. Regarding headset, knowing it takes a Mindset is all the info I needed. As for forks, will probably source a 3T funda. Have some other 3T finishing bits in bin so would contemplate. Group will be mixed Sram 10sp, wheels something cheap.
Excellent! One has turned up locally and thinking about building it up as winter go fast bike.
Can you tell me what headset it takes? Also interested to know about tire clearance, can it clear 28s?