RE: [CR]Spoke-to-cog spacing?


From: "Ken Freeman" <freesound@comcast.net>
To: "'bit_eimer'" <bit_eimer@cox.net>, <classicrendezvous@bikelist.org>
Subject: RE: [CR]Spoke-to-cog spacing?
Date: Fri, 20 Oct 2006 07:01:38 -0400
In-Reply-To: <005f01c6f3c9$a7b682d0$0902a8c0@PanzisLANHost1>
Thread-Index: AcbzyaufyrThKKbNQgi9UpLxYFP8ewAa1zeA


Derek,

I couldn't tell you anything about standard or typical or minimum required spacing. I can say a few things. First, you say the clearance from the cog to the spokes may be too great. So I assume you are not able to limit the inward travel of the derailleur cage.

First, we all know the adjuster screws on the rear der are supposed to prevent this interference. If you've been working on this in the wee hours of the the morning,n perhaps you need to re-try this adjustment in the light of day.

If that doesn't or hasn't worked, i.e. the adjustment is at its limit, perhaps the mechs you're trying are of greatly different vintage than the frame. I admit, I'm not that familiar with E-Bs. I had a problem fitting an off-topic Campy triple derailleur onto my Woodrup Frankenbike, and I had to size new adjuster screws to make it set up right, i.e. buy new screws and grind to fit. I did not have a bent dropout.

Finally, get the dropout alignment checked. There is a tool for this, and you'll need to find a shop or bud who has one (not me, btw). You can eyeball it with a known-good derailleur and a plumb line. Sight once on the frame to get the frame vertical, then sight again on the derailleur cage to assess its alignment.

What's the hub? Is it odd? I'm a bit lucky in having Campy NR/SR on nearly all my bikes, so I don't have to deal with odd compatibility issues. Anyway, perhaps the hub is odd.

My 2 cents!

Ken Freeman Ann Arbor, MI USA

-----Original Message----- From: classicrendezvous-bounces@bikelist.org [mailto:classicrendezvous-bounces@bikelist.org] On Behalf Of bit_eimer Sent: Thursday, October 19, 2006 5:58 PM To: classicrendezvous@bikelist.org Subject: [CR]Spoke-to-cog spacing?

Hi all,

I've been refurbishing my last Ellis-Briggs and run into a little problem. Three different rear derailleurs (NR, Jubilee, off-topic newer Campy "Rally") that I've tried all want to run into spokes on the top cog. At first I attempted to deal with this by using a freewheel spacer, but now it really looks like that gap is too large. Now I'm suspecting that the drop out is bent in a tad, thereby angling the der cage in too far.

So my question is: what is typical minimum cog-to-spoke spacing (70's era components)?

Thanks,
...Derek Davis, Phoenix