>Delivered-To: classicrendezvous@bikelist.org
>From: Jeff Slotkin <jeffslotkin@comcast.net>
>Subject: Re: [CR]Campy Triple Bolt Circle,
>
>
>Modifying an off-topic 94mm ring would be cheap and easy, but look
>funny.
>
>Jeff Slotkin
>Goose Creek, SC, US
Dr. Dremel says:
Modifying a 94 mm BCD chainring is cheap and easy, AND it looks just fine. Anodizing is a close enough match to the natural aluminum finish on your vintage Campy stuff, unless you use a purple anodized ring. A few strokes with a rat tail file (3/8 inch diameter? I don't remember for sure.) to enlongate each bolt hole and you're in business. Most of the enlongation and any imperfections in your work disappear beneath the bolt heads. And what is still (barely) visible is on the inside of the face of the chainring and crank where it's difficult to get your face and bifocals in between the frame tubes without getting hurt, or finding that lovely chainring grease pattern on your forehead.
32 T is about the minimum that's readily available anyway. I haven't seen any 31 tooth mtb rings, and a 30 T would lead to chain and bolt head interference.
Go nuts. It's okay. You're only sacrificing a cheapy MTB ring. It was going to be horribly abused anyway.
Larry "aka Dr. Dremel" Osborn Morgantown WV
>On Sep 23, 2007, at 7:28 PM, David G. White wrote:
>
>>Is there any company making 100mm BCD chainrings today that would
>>fit the campy triple? I'd love to buy a couple or three 32T rings.
>>
>>David
>>
>>David G. White
>>Burlington, VT
>>
>>
>>
>>John Thompson wrote:
>>>Jeff Slotkin wrote:
>>>
>>>
>>>>What is the inner circle of the triple that came with a 36 tooth
>>>>ring,
>>>>and what is thus the theoretical minimum number of teeth for that
>>>>ring?
>>>>I can see from the pic it could go lower than 36, if someone with
>>>>too
>>>>much time on their hands wanted to make the ring.
>>>
>>>I don't recall the BCD but Merz Engineering used to make a 32T
>>>ring for
>>>the Campy triple.