The Miyata Sport-10 dates from 1984 to 1986. The 1984/5 model was a 10 speed, while the 1986 model was 12 speed. Specs varied quite a bit, depending on the year. The 1984 model had a plain gauge main triangle made of hi-tensile steel. It was upgraded to CrMo in 1985, then downgraded to Mangalight in 1986. The stays are hi-tensile steel, regardless of the year. The rims may be aluminum or steel, depending on the year. The crankset should be a swaged, cotterless design with what appears to be steel chainrings. Derailleurs are respectable SunTour Seven with stem shifters. Brakes should be Dia-Compe 730 or Shimano Z-series side-pull with safety levers.

There was also a Sport-10FF model that used Shimano's Front Freewheel system.

If the above means nothing to you, then let's state that it is the bottom of the line model and cost $165 US in 1985! It's also quite heavy, at an advertised weight of 30-32 lb. Without knowing the market and condition of the bicycle it's hard to establish a price, but unless it's mint and/or you are in a very expensive market like New York city, the price is way too much!

On the postive side, Miyata made very nice bicycles. Even the entry level models were properly designed, well manufactured and nicely finished. They were excellent value for their price range.