The main differences between the two were the 110SP had aluminum rims and a self centering device on the Dia-Compe 500 brake calipers. There were also different model sub-catagories, for example, there was a 110SP and a plain 110. By the late 1970s Miyata began using the same names, writing out the numeric names (e.g., Miyata Seven Ten) Early on Miyata models carried numeric names (e.g., Miyata 710). The rest of the characters are numbers.Īnother way of narrowing in on the year of manfacturing is if the model number on the top tube is either printed in numeric form or written out. The ones column for the month is the first character of the second line. The last character will be a number “0” or “1”, the tens column of the number for the month that the frame was made. The next character will be a number for the year of manufacture of the frame, probably “9”, “0”, or “1”. The first two characters will be “D” and “S” for Dod Sun. The first line of the serial number will 4 characters, widly spaced. The subject bicycle was manufactured by Dodsun of Taiwan in December 1987, making it a 1988 model. 2020 Bike Forums)Īn example of this serial number is below: Dodsun made the entry level Victor, Triton and Nimbus models in 1987. Miyata entered a manufacturing contract with them around late 1986. These models were manufactured by Dodsun of Taiwan. Some Miyata serial numbers had two line serial number. The lettered stickers/decals are thought to be inspection stickers.

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.ġ972-1984: Yxxxxxx, where A = 1972, B= 1973,….M= 1984.ġ985-1989: YFxxxxx, where N=1985, O = 1986,…S=1990.

Lotus bicycle serial numbers