Well, I assume that the shoulder on the 151 1/8" track rings was purely a strength thing. Would the remaining shoulder on the newly formed 3/32 ring be for strength in a pursuit application? I wouldn't think that any additional strength would be needed, but Campy always overbuilt their stuf.
John Barron
Minneapolis
> Pursuit chain rings, made specially?
>
> Dale Brown
> cycles de ORO, Inc
> 1410 Mill Street
> Greensboro, NC 27408 USA
> 336-274-5959
> http://www.cyclesdeoro.com
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> Giant, Specialized, Bianchi, Felt, Orbea, Litespeed, Kuota, Argon 18,
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> -----Original Message-----
> From: john barron- velostuf <jb@velostuf.com>
> To: classicrendezvous@bikelist.org
> Sent: Sat, 12 Nov 2005 16:54:29 -0600
> Subject: [CR]Re: FS Campag chainring. 152 bcd. Unusual.
>
> Martin-
>
> 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
> Minneapolis
>
> Martin Coopland wrote:
>
> I have an unusual chainring FS. Its a pre '67 campagnolo one, 52 teeth
> for
> 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
> chain
> teeth.
>
> 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.
>
>
> Regards
> Martin Coopland, Scotland, http://www.BatesBicycles.com
>
> John Barron
> Minneapolis
> http://www.velostuf.com