Join Date: Jul 2000
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
Mentioned: 10 Post(s)
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Where is your chain rub occurring? I have converted every one of my 5-speed bikes, all originally with a 120mm overlock rear axle length, to either a 6-speed ultra (for 122mm) or a regular 6-speed (for 126mm) freewheel, with no ill effects whatsoever. If the chain is rubbing on your front derailleur, it probably needs adjusting. If it is rubbing against your chainstay, you need to add a washer to the drive side of your rear axle and redish the wheel accordingly.
As for the jockey wheel problem, been there --- done that. I just replaced the worn-out pulleys in my Campagnolo 980 (homely cheapo but functional update of your much nicer-looking NR) with a couple of Shimanos, and it works like a champ. Subject only to some minor bolt diameter constraints, you can put almost any pulleys in that old derailleur, although old school pulleys will have less lateral float than those designed for index use, and will therefore probably give you more accurate shifting.
"Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1981 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069