Early MIAMI Chainring Sprocket

[Nostalgic Dave]

Very hard to find Colson Miami chainring. Nickel plated with some side wear on some of the teeth. Pretty nice overall and would look great on a survivor bike, or re-plate it for a restoration project. $10 priority USPS shipping in the USA.

 

[Archie Sturmer]

Looks like a smaller 5/16" drive pin hole found on Miami bicycles, but it could be just the pictures of the 26-tooth chain ring front sprocket?

Usually the Miami chain rings have the drive pin hole on the opposite side (180-out).

 

[Nostalgic Dave]

Looks like a smaller 5/16" drive pin hole found on Miami bicycles, but it could be just the pictures of the 26-tooth chain ring front sprocket?

Usually the Miami chain rings have the drive pin hole on the opposite side (180-out).

The pin hole is 5/16". That's interesting, and going by your post here, I'm just confused now.

 

[Archie Sturmer]

Yes, even I was confused when I re-read my 2019 post, out of context.
The OP had a ~1920 Miami built Simmons; and I posted a contrasting picture of a ~1930's Shelby crankset.

The Shelby chain rings had fairly common dimensions for the drive pins, diameter and offset.

Miami was a manufacturer that sometimes used both an undersized 5/16" drive pin, and a peculiar offset; (but not often seen on that side of the sprocket).

Wonder if it was an improvement since it required 1 fewer hole punch actions and 1 fewer hole punch shapes (1 fewer separate tools).

 

[Nostalgic Dave]

The pin offset is 1.3" on the mic. I have another (and have had others) Miami ring with the huge 2" offset.

 

[Nostalgic Dave]

This, from a Colson claimed to be a '32

 

[Archie Sturmer]

Notice that the Colson sweetheart sprocket has 24 teeth, (works well with 28” wheels), and Colsons have fairly common dimensions for the drive pin diameter and offset.

Some might say that the Colson 26-tooth sprocket, (used with their 26” balloon tire bikes), looks more like an A&S.

 

[Nostalgic Dave]

Notice that the Colson sweetheart sprocket has 24 teeth, (works well with 28” wheels), and Colsons have fairly common dimensions for the drive pin diameter and offset.

Some might say that the Colson 26-tooth sprocket, (used with their 26” balloon tire bikes), looks more like an A&S.

Ah yes. Well shoot! So this is a Miami then, or still a mystery? The Miami chainrings I've had all had the really wide pin offset, which this doesn't have.

 

[SKPC]

Here is the Miami version from the late teens, the earliest maker I believe of the traditional SH ring. 1" shaft opening, (all Miami?) 5/16th (small) drive pin hole.(not all Miami) and 1-3/8" hole spacing.(not all Miami). It has a bit finer(thinner) arm architecture but closest to Colson.. And YES! Good luck with your sell, nice ring.

 

[Nostalgic Dave]

Thanks guys! I guess we'll call it a variant of the early Miami ring. One of a kind, worth BIG BUX!