My travels to see bike parts from the era doesn't get me to within 1% of what you've seen, because YOU WERE "THERE!"
I've created a page on my Website that shows what I'm talking about with this 151 chainring:
Speaking of the CRVBA, while everyone is there, browse around and take a look at who won the 2005 CRVBA (Classic Rendezvous Vintage Bicycle Award)! Since the CR in NC will be in June, 2006, nominations and voting for the 2006 CRVBA winner will start just B4 X-Mas and end near the end of Jan. Lou Deeter will be announcing more details later.
John Barron (Velostuf)
> John: I've seen a fair amount of ground down or machined chainwheels from
> 1/8 to 3/32.
> Maybe I was exposed to more European racing stuff in Chicago than you were
> in Minneapolis?
> It's nice to find custom stuff like that in that it was probably made for
> a specific rider or purposely made for sale with a contender purchase in
> ----- Original Message -----
> From: "john barron- velostuf" <firstname.lastname@example.org>
> To: <email@example.com>
> Sent: Saturday, November 12, 2005 2:54 PM
> Subject: [CR]Re: FS Campag chainring. 152 bcd. Unusual.
>> When I was in Tokyo recently at a swap meet, I saw the exact same thing-
>> it was a 151 mm BCD Campy track chainring with the large shoulder on the
>> inside. BUT, it was 3/32"!! This was impossible. I had never seen this
>> before- I don't believe that any 151 BCD track rings, (with shoulder)
>> were made with 3/32" width. I showed it to some knowledgeable Japanese
>> collectors, and at first there was excitement, because what they saw was
>> what I saw... an impossibility! Then one noticed that both the shoulder
>> and the teeth had been very nicely ground down. This was confirmed when I
>> looked at the tooth profile from the edge- it was not symmetrical. It had
>> been ground down on one side only. So, what we had was a 52T 151 3/32"
>> road ring, (less common) made from a 52T 151 1/8 track ring, (more
>> common). I bought it.
>> John Barron
>> Martin Coopland wrote:
>> I have an unusual chainring FS. Its a pre '67 campagnolo one, 52 teeth
>> 3/32nd chains.
>> The unusual bit is the large shoulder on the inside of the teeth circle.
>> This makes it look like a track chainring although they are narrow 3/32nd
>> Can any one shed any light on what this was for?
>> Condition is used but Ok ish, surface is dull but not hugely scratched.
>> Teeth have plenty of life left. $55 including airmail.
>> Martin Coopland, Scotland, http://www.BatesBicycles.com
>> John Barron