Join Date: Mar 2005
Location: SF Bay Area, California
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What year? He's referring to the head tube geometry, which affects the handling characteristics. Some bikes built in the suspension fork "transition years" were built with both rigid & suspension forks in mind.
If you can find a 60mm travel fork you're likely not going to throw the feel of the bike off much. Put a 140mm travel fork, and you'll feel like you're on a chopper.
Watch out! I don't know GT's history, but your frame may require a fork with 1" steerer tube, which are getting harder (i.e. more expensive) to come by.