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Tried to get it ttt for you a few times, but for whatever reason none of the gurus have answered. Jeff might be onto something there but i clicked around and didn't see anything definite and have also found some resources like Bikepedia to be wrong sometimes. Ong might be onto something also, but since you don't know if you have a quill, at this point I'd recommend bringing it into your lbs. Any decent mechanic, will tell you just by looking at it, what size headtube, and what size steerer you got there. Plus you'd need/want a tool to get the bearing on/off to measure since you can't tell.
Contact Specialized with serial # ?
I suppose you could measure the outside circumference and compare it to another known 1 1/8 bike, built from the same material, steel, aluminum, whatever.
Contact Specialized with serial # ?
I suppose you could measure the outside circumference and compare it to another known 1 1/8 bike, built from the same material, steel, aluminum, whatever.