1.125"...: Bikefanclub.com

P.S. Given what I said above, I would personally go with a 1.125" steerer, simply because of the relative ease of replacement. The term "emerging standard" has been used rightly. On a 58cm or larger frame, or if you have a tall spacer stack, then getting a fork like the Alpha QZ Pro might be desirable, as there is no stack limit, due to the much thicker-walled, 450mm steerer. This fork comes in 1.125" steerer diameter ONLY.

Reducing:
If you do have the larger head tube, Chris King makes a headset called the "Devolution" which will resolve the difference by reducing the diameter to 1" on the inside. Craig has said that this works for reduction but a shim would not. The crown race has to sit somewhere, right?

Expanding:
Keep in mind if you are building a 54cm or smaller, Calfee head lug molds are only suited to a 1" tube. You can pay $175 extra for a hand-wrapped head tube if you want a 1.125", but you'll lose the sexy sculpted lug work of the Dragonfly. If you own a Calfee with a 1", and want to upsize, then it would require a full head tube re-mold, which costs $450 plus paint and shipping.

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