Without wishing to hijack this thread further ... its an area I've read up on because it interests me but I'm no expert. I found a link to a thread on google groups which is relavent and includes a post by KB himself regarding the bontrager geometry.http://groups.google.com/groups?threadm=856807356.4680%40dejanews.com&rnum=7
sounds like its not just as simple as one thing 'speeding up steering' OR slowing it down. Pity he didn't have time to go into it further as I'd love to read more.
Very clever of you to find those words of wisdom! I don't think we're hijacking the thread. After all, my notion that the big offset/short trail on the 'beginners' bikes' in the Kona range was to make them less twitchy and easier to ride is bang in line with LeGrandeFromage's report that radically reducing the trail on this Specialized had made it very twitchy. [And I assume he meant on the way to the pub, as we can safely ignore whatever he thought about it on the way home.]
I don't pretend to understand about geometry either, but I did note that KB was talking about fast cornering, where you don't actually turn the handlebars, so maybe trail is less important. Another factor is that LeGrandeFromage hasn't changed the stem, so his weight through his hands is now 2.5" further forward in relation to the front axle and that may have almost as big an impact on how twitchy the bike feels as a few glasses of Squaddicott's Old Peculiar down at The Dog and Duck.