How do I determine the year model of my Nishiki Sport road bike? I have had it since the 1990s when I bought it at a garage sale. I want to do some updates/upgrades on it, and wonder if there are any unique limitations of what I can do. I finally started riding it in 2008/9. I rode it in a 40-mile charity ride in 2013 (I think).

So, I am trying to figure out what year it is, and whether it is aluminum, steel or something else altogether. Is there a website where the serial number ranges are listed? Or is the year model like a car's VIN, and coded into the serial number? This one indicates that it was made in Taiwan.