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Whyte 603 (2017) with a FSA No.10 headset. All I can find out is thats its for 49/50 OD headtubes. I know on my older Voodoo I could run an external headset cup and fit tapered forks, can the same be done here? If not, do better 1+1/8th forks still exist new?
is it 44mm internal (I think the no. 10 is for 44mm internal), in that case its easy to fit tapered forks. Just need a new bottom bearing like a hope H

Nukeproof make an external cup version too for 44mm headtube and 1.5” steerer (at the bottom)
Option EX44-40 - B5
http://www.chainreactioncycles.com/mobile/nukeproof-mix-match-bottom-headset-cup/rp-prod124574
The only thing you need to be sure of is your headtube being deep enough to allow the cup to be inserted incase it taperes out from 44mm inside.