This is question is begging for the response I hate to make- read the archives.
However, Dave's recipe gives good details of what must be done to make 28T work. What I say is, why torture the poor thing? The dropout is not intended to be used all the way back. What about the short dropouts? Why not take the adjusters out all together? Do you really want an extra 3/4" of effective chainstay length from either a functional or aesthetic viewpoint? Why size the chain for the big/big combination? It is likely useless in practice and now you are setting out to torture the chain, at least a stiff classic chain.
There are so many decent wide range derailleurs that tormenting a Nuovo Record is just a bad practice. If you simply must have a Nuovo Record, use a 25t max freewheel cog and a chainset that allows a 38T or lower in the front. For a Campy purist you could use a NR triple or a Gran Sport (with TA or other 3 arm rings), or the 116mm BCD five arm Gran Sport. A TA or Stronglight with a 36T or 38T inner ring is a good choice also.
Joe Bender-Zanoni Great Notch, NJ
David Feldman wrote:
> I have set up a number of bikes with 10-tooth front
> chainring gaps, Nuovo Record rear derailleurs, and 28
> tooth low gear cogs. Two things are necessary--the
> shortest possible chain, and reassembling the dropout
> adjusters so that the axle can be placed as far back
> as possible in the dropout slot--remove the spring
> from between the head of the adjuster screw and the
> inside surface of the dropout and replace it between
> the outside (rearmost) surface of the dropout and the
> little adjuster knob. Set the rear wheel back
> absolutely as far as possible in the dropouts. Cut
> the chain to the length that just barely will let it
> be shifted to the large chainring/28tooth combination.
> It may grind a little going onto and off of the
> 28/small ring combination but it will make that shift
> reliably and consistently.
> David Feldman
> Vancouver, WA