Ok so after more than a few hours looking at all the catalogs and this thread here is where I'm at on the FM chain rings. Keep in mind some of these chain rings may be found on other Miami products in different years. I have not seen any ads showing the 1912 FMs but the 1912 Racycle cat shows the sweetheart rings for the juvenile models so an assumption on my part is that the earliest FM juveniles most likely used this ring as well. Dates followed by a question mark are my best guess and any evidence to support or refute these dates is welcomed. This goes for any other rings/tooth counts/drives that you feel are in error. Ok SOTFM did you just hear a bell ring?
Solid center clover leaf (1” pitch) 26T, 28T (1912?-1916)
Cut out Cloverleaf (1” pitch) 24T (1920-1923 Racer center drive), 28T, 30T (1916-1917)
Cut out Cloverleaf (1/2” pitch) 48T, 60T (1912?-1916)
Star (1” pitch) 30T (1914?-1917)
Star (1/2” pitch) 60T (1914?-1917)
Five spoke (1/2” pitch) 60T (1918-1919)
Circle of "F"s 28T (center drive) (1920-1923)
Sweetheart 22T (Juvenile 1912-1922), 24T, 26T (1914?-1923)
*Five spoke ½” pitch 26T not used on FM
View attachment 416425
Solid Center Cloverleaf
View attachment 416426
Cutout Cloverleaf
View attachment 416428
Star
View attachment 416429
Five Spoke
View attachment 416430
Circle of "F"s
View attachment 416431
Sweetheart