I've usually had trouble making NRs work well with any rear sprocket bigger than the rated 26 teeth, at least with the usual 52/42 chainset. Others may have done better than I.
In friction shifting modes I've never had any problem with 7-speed freewheels, if the chain was appropriately narrow for the freewheel. I've also found them to handle 13 tooth small gears with no problem.
Hope this helps!
On Sun, May 23, 2010 at 11:20 PM, Steve Whitting <ciocc_cat@yahoo.com>wrote:
> Back in the late 1970s I ran a Campy Nuovo Record with a 14-28t 6-speed
> (normal spacing) freewheel on my Austro-Daimler club-riding bike (a Reynolds
> 531 "Inter-10" light touring frame built-up with the Campy gruppo salvaged
> from my old "too-big" Raleigh Pro). I recall that shifting on to the 28t in
> the very steep hills of northwest Arkansas was "okay" at best with 52-43
> chainrings and there were some chainring/cog combinations I didn't dare use,
> but it still worked (albeit probably not very good by contemporary
> derailleur performance standards). The problem was the limited amount of
> chain that a Nuovo Record can wrap.
>
> Steve Whitting
>
> Prairieville, Louisiana USA
>
> Website at http://ciocc-cat.angelfire.com/
>
> --- On Sun, 5/23/10, damien roohr <droohr@comcast.net> wrote:
>
> From: damien roohr <droohr@comcast.net>
> Subject: Re: [CR] Freewheels FS - now NR RD performance question
> To: "James Valiensi" <valiensi@mac.com>
> Cc: classicrendezvous@bikelist.org
> Date: Sunday, May 23, 2010, 7:51 PM
>
> Question for the campy experts out there --
> Can a Nuovo Record handle:
> 6-speed 14-28 freeewheel?
> 7-speed 13-26 freeewheel?
>
> The basic questions are - upper cog size limits of the NR & performance
> ability lock-on closely spaced cogs such as the 7-speed. (Note - in
> pre-index 80's my Suntour Superbe Pro RD had no trouble navigating New
> Winner Pro 7-speed freewheels. However, current RD in question is circa
> 1974. )
>
> Thanks!
>
> Damien Roohr
> Canton, CT
>
> Original Message -----
> From: "James Valiensi" <valiensi@mac.com>
> To: classicrendezvous@bikelist.org
> Sent: Sunday, May 23, 2010 7:07:39 PM GMT -05:00 US/Canada Eastern
> Subject: [CR] Freewheels FS
>
> Hi,
> Anyone interested in some old freewheels?
>
> I've got 3 Suntour Winner Pro's $25 each or $70 for all three.
>
> 2 Dura Ace at $25 each
>
> 1 Suntour Comp $20
>
> and 2 Regina freewheel cans w/ cheep freewheels for $10 each or $15 for
> both.
>
> All prices less shipping, but shipping will be at actual costs.
>
> Photos at :
> http://www.flickr.com/
>
> Thanks,
>
> James Valiensi, PE
> Northridge, CA
> H818.775.1847 M.818.585.1796
>
>
>
> _______________________________________________
> _______________________________________________
>
>
>
>
> _______________________________________________
>
--
Ken Freeman
Ann Arbor, MI USA