ganbatte!
Join Date: Aug 2004
Location: nyc
Posts: 1,648
Bikes: '06 Vanilla touring, '09 Vanilla cx, Zanconato cx, Moots Psychlo-X RSL prototype, Nagasawa track, Kalavinka track, Black Cat 29er, Cannondale Rize 2 26er, Serotta CRL Legend
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The 6000 is the size, the letters at the end denote the types of seals, among other information -- it's an ISO naming convention.
Z = single pressed steel shield
ZZ = dual pressed steel shields
RS = single contact seal
2RS = dual contact seals
N = retaining ring groove around the edge of the bearing internally
NR = retaining ring groove around the edge of the bearing internally, with retaining ring
So, for our purposes, 60002RS bearings would be optimal, performance wise. Some bearing manufacturers don't follow the ISO naming standard (NTN and NSK among others) but you can find high-performance parts from folks like ***, SKF, Steyr, and Koyo without problem.
Last edited by sashae; 01-23-07 at 04:14 PM.