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Enduro 6806 LLB Radial Bearing - ABEC-3 C3 Clearance 30mm x 42mm x 7mm Model=RR 511 }SRAM PG-1050 Cassette - 10Enduro 6806 LLB Radial Bearing ABEC 3 C3 Clearance 30mm x 42mm x 7mm. Enduro Standard Design Cartridge Bearings. 90% filled with Mobilux NGLI 2 synthetic grease dual lip labyrinth seals If the bearing you are replacing is not marked with a manufacturer number measure it and compare to specifications listed TECH SPECS Bearing I. D. (mm) 30 Manufacturer Number 6806 Bearing O. D. (mm) 42 Material Stainless Steel Thickness 7