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ENDURO BEARINGS 6903 LLU ABEC 3 MAX bearings, 17 x 30 x 7 6903LLUMAX Read more..
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ABEC 3 MAX radial bearing with 10 mm inside diameter, 19 mm outside diameter, 5 mm width and double lip seal with strong contact, running in a groove in the sense of a labyrinth seal. MAX bearings have been specially developed for the rear end bearings of bicycles where there are no full revolutions during operation. These bearings are filled with 35-40% more "Almagard Extra High Pressure Grease" than conventional bearings. They also have no cover or slots for the balls. They can therefore be MAXimal in their size and number. The running surfaces are also deeper in order to be able to absorb more lateral forces. MAX bearings do not rotate as easily as conventional ball bearings and should be used for rear triangle swivel joints and problem areas where there is increased wear. ABEC 3 bearings use grade 10 chrome steel balls and 52100 high carbon-chrome alloy treads. The precision balls are round with a deviation of 10/1000000 ", which is twice as round as the industry standard. The alloy of the bearing shells are manufactured in a vacuum process and hardened to Rockwell hardness R-62. Then they are polished to a high gloss for ABEC-3 Precision and noiseless operation, the riveted steel cage increases toughness.