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I recently acquired a mid- to late-90s Giant Boulder Alu Lite. I am thinking of replacing the threaded fork for a threadless fork, in order to have more access to oversized handlebars. (All the lower priced stuff appears to be oversized.) Several posts i read gave me impression that the quill to threadless adapters are not really that great, which is why I'm considering the threadless idea.

I am having the hardest time figuring out the exact diameter of the fork steerer. It appears to be between 1 and 1 1/8th. It depends on the measurement points used. Many people claim most MTBs made after 1995 have a 1 1/8th fork diameter.Is there another way to verify? I don't have any spare forks to usefor comparison.

I checked Giant's website for manuals -- no luck.

Thanks!