Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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Campy NR derailleurs use basic pulleys with a 5mm through bolt. This is far and away the most common type of pulley, and there's a vast selection to choose from. You can have all metal or plastic, simple bronze bushing with end covers or ball bearing.
Based on years of experience, this is one of those few applications where cheaper is better. I've found plastic pulleys on bronze bushings to run quietest, and need the least service (just about zero).
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance