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Early MIAMI Chainring Sprocket

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Price
$75
Location
Cheney, WA
Zipcode
99004

Dave Stromberger

I'm Afraid I Can't Let You Do That
System Administrator
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.

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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).
 
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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.
 
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).
 
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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.
 
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.
 
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.
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