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Specialized Stumpjumper suspension bearing kit for 120mm frames manufactured in 2007. Includes 12 pcs Enduro MAX (full complement for greater load strength) sealed cartridge bearings with Black Oxide anti-corrosion bearing race treatment.
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  • ENDURO "MAX" What Does 'MAX" Mean? "MAX" is Enduro's trademark for "full complement" bearings. These are application-specific bearings which have no retainers, allowing more balls to be packed inside of the cartridge. Compared to their caged counterparts, MAX bearings have an increased load capacity of 40% or more. They are ideally suited to high-load, low rotation applications (such as suspension pivots). MAX-E bearings are made to the same specifications, but the "E" designates a special extended inner race to eliminate the need for spacers. THE BALLS are made from chromium steel. These high precision Grade 10 balls are 10/1,000,000” from exactly round in sphericity. For comparison, Shimano and Campagnolo use grade 25 balls in their top-level components. When talking ball grade, the smaller the number, the "rounder" the ball. And remember--MAX means extra balls for greater strength. THE RACES are vacuum de-gassed 52100 high carbon chromium alloy steel, hardened to Rockwell C-62. NO RETAINERS. Remember, that's the whole point with MAX bearings: More balls for greater strength in low rotation, high load applications. THE SEALS are "LLU" medium/high contact labyrinth type, with 2 sealing lips which fit into a matching groove on the inner race. The outer sealing lip repels dirt and water while the inner sealing lip retains the grease. When the bearing is first turned, you will notice some grease will come out of the seals. This fills the chamber between these 2 sealing lips, forming a “hydromatic seal.” In MAX bearing applications, such as suspension pivots, we are more concerned about keeping contaminants on the outside and lubrication on the insided than we are about reducing seal friction. This makes the LLU a perfect match. LLU: A full contact, dual lip seal riding in a groove on the inner race. With more sealing pressure, these are ideal for pivots or headsets that continually come in contact with dirt, sweat, and dust. The increased seal pressure and 2 lips help retain the 90% grease fill we use on these bearings to better displace any moisture and continually lubricate the balls and races.
MAX bearings provide 35-40% more load capacity than standard radial bearings by employing with a special design where the maximum number of balls (full-complement) are inserted into the bearing, via a custom ground slot in the races.
The race grooves are also deeper on these bearings to provide increased lateral support to counteract the twisting and multi-directional forces associated with mountain bike pivots.
This MAX-type, Black-Oxide, ABEC-3 bearing features deep-groove design races, with Grade 10 balls and full-contact, double-lip, labyrinth (LLU) seals for maximum protection against the elements, while keeping the 90% fill of Almagard extra high pressure grease inside and Black-Oxide/Magnetite coating provides an extra level of corrosion resistance and extended worry-free performance.

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