1.18th h.s won't fit frame

What frame is it?
What headset is it? (Red FSA is a bit vague).
Borrow/buy some vernier calipers and measure as mentioned by scotyproonly above.
 
Re:

The con man on pink bike as replied to me and it's a external type headset and will only fit frames designed to. Fit them it's a orbit z if that helps
 

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