[CR]Widest possible Campy NR ratio range: Depends.

(Example: Framebuilders:Alex Singer)

Date: Sun, 18 May 2003 15:27:57 -0400
From: "HM & SS Sachs" <sachs@erols.com>
To: classicrendezvous@bikelist.org, CYCLETRUCK@aol.com
Subject: [CR]Widest possible Campy NR ratio range: Depends.


Calvert Guthrie asked:

Lets say hypothetically I just scored an early 70's(#173538) Mondia Special with NR derailleurs.....

---What is the widest possible (10 or maybe 12 speed) gear range I can get sticking with the Campy hubs and crank set and derailleurs?

---What is the smallest available ring that will fit the inside bolts and still not require more chain-wrap than the r/d NR will accommodate?

I have long cages and triples on everything else but I'd like to keep this Mondia close to original. I'm trying to get some more mileage out of these knees before I'm forced to consider replacement.

==============

If memory serves correctly, we used a 13 - 31 Regina with my wife's Atala and a ("steel") Record in the late 60s, with no trouble. But, we only used a 4th or 5th difference in front, typically running a 40/45 combination to get half-step shifting. As the difference in front goes up, the rear capacity goes down.

BTW, the Record is comfortable with the 13 th top, but I could never get the preceding Gran Sport to work with anything smaller than 14: just plain skipped, no matter what chain or spring tension I used. But, in its defense, it was marked "14 a 26" denti (or something like that).

harvey sachs mcLean va

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