 1000 series and X000 series bicycles, with the notable exception of the 1000 touring model, were competition/fitness models with non-ferrous frames.Often (but not always) the last two digits of the model number indicated the number of available gears, e.g., 912 was a 9-series 12 speed and a 914 was a 9 series 14 speed.Miyata's frames manufactured in Japan since 1972 have been stamped with a serial number, the first letter of which indicates the year of production.