Set of two (2) ultra high performance sealed engine bearings. 52100 chrome steel bearing material, ceramic Si3N4 (silicon nitride) rolling element material. Two shield chrome steel enclosure and high speed polymite composite retainer. Rated to 46,000+ RPM. 12mm inner diameter, 28mm outer diameter, 8mm width. Fits Zenoah G23LH / G230RC / G260RC / G260PU / G260PUH / G231PUH / G231PUM / G260PUM / GZ25N14 / GZ25N23 engines. Also fits Chung Yang CY23RC / CY26RC / CY27RC / CY29RC / GP290 engines.
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