Nice looking Premio. The '88 catalog (oh yeah is an '88) does not have a geomentry chart and the '89 doesn't show the Premio. It does show the next model up the Sport SX and that shows 73d parrellel for the HT/ST and 45 for trail.
I assume my '87 Sport SX is very similar, and while she is quick I am not sure I would call her twitchy.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk