If you have an integrated bottom headset and 1⅛" steerer you can switch to the Cane Creek external headset and tapered fork. If it's external bottom headset and 1⅛" you're buggered. Think that's the rule of thumb.
If you have integrated, the headtube has bearing cups already in, The cane creek requires press 15mm depth. You’d have to have an internal headset which has separate press in cups that you could take out.
External as opposed to integrated or whatever
If you have an integrated bottom headset and 1⅛" steerer you can switch to the Cane Creek external headset and tapered fork. If it's external bottom headset and 1⅛" you're buggered. Think that's the rule of thumb.