Hello, I am looking for a decent, entry level road bike, and came across this on craigslist. I am a novice/beginner, but would appreciate someone's help on identifying if this is really a 1986 SR600 Cannondale, and/or what it would be worth. Would like to make some slight modifications to it, but would only invest the time and effort if the bike was worth it. Also, do you know if it is possible to convert to a singlespeed freewheel? I doubt it has a horizontal dropout (for a vintage) so any help/input would be great! Thank you.