Fitting a Fork to a Specialized Allez

cabbagetom said:

I'm not sure which kind of headset would fit in to this frame? And can I then use any kind of threadless fork?

The headset will be specific to the frame. Probably, a Cane Creek integrated headset will fit BUT you'll want to check the Specialized website (use the CONTACT function to query them if the information isn't readily discernable).

In the worst case scenario, you would use a PROBLEM SOLVERS shim (probably, about £15) to fit a particular diameter bearing-or-headset-cup inside the headtube of a "problem" frame.

As far as the fork, you "can use any kind of threadless fork" as long as the diameter of the steerer is correct (i.e., 1 1/8"😉 ...

While some forks are intended for internal/integrated headset bearings and some aren't, the difference is mostly a cosmetic matter ... the bearing "race" that fits on the fork's shoulder will be a larger diameter for an integrated headset, but the larger "skirt" will be shrouded by the frame's head tube ... either way, the "line" between the head tube & fork won't be as sleek if you use an "older" fork which is designed for a headset which has external cups.