Originally Posted by
theblackbullet
I've noticed in the catalog the ST600 uses a different fork than what I have on the bike. It looks like Cannondale reached into their parts bins to equip these bikes and it really seems that the fork was intended for 27" wheels instead of 700c.
That's not uncommon for older Dales; prior to 1990, they were still really small, almost a boutique builder. Component swaps that didn't make the catalog are not unheard of, particularly the niche models like the Touring / STs.
Often, too, the individual bike photographed for the catalog was one of the very first of the production run, or even one of the previous years' model (a 1990 "dressed" as a 91) so some of the details are not as pictured.
Could just be a change of brake arms is in order. A 90s MTB style like the DiaCompe 988 has a pretty big adjustment range, or something modern like the Avid Shortys would get the adjustment you need.