Compare ENDURO ABEC 5 All-Steel Bearings with any other brand.  Nobody can approach our specifications anywhere near our price... 

What Does ABEC 5 Mean?  ABEC 5 is a standard which requires each bearing to pass many tests in order to meet the scheduled requirements.  This includes noise testing at high RPM, extremely tight tolerances for the internal diameter, outer diameter, roundness of ball, trueness of races, and surface finish of all of the above. This is a much higher standard than ABEC 3, even though only differing by 2 digits in rating.  
THE BALLS are made from chromium steel. These high precision Grade 5 balls are 5/1,000,000” 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. 
THE RACES are vacuum de-gassed 52100 high carbon chromium alloy steel, hardened to Rockwell C-62.
THE RETAINERS are nylon with Graphite and are virtually frictionless while providing constant lubrication.
THE SEALS  are "SRS" (Snap Ring Seals) or "LLB" (light contact, dual-lipped labyrinth).  Both are effective at sealing while keeping drag to a minium.  

SRS: Featured on many of our ABEC 5 level bearings, these seals employ a snap ring that can be removed with a small knife for quick and easy servicing. These seals can be removed with no danger of bending them while performing lubrication service, ensuring they will spin as smoothly after. The single sealing lip makes contact on a step machined into the inner race, and sealing as an axial face seal. This type of seal configurations has extremely low rolling resistance and speed, while being an effective barrier against dirt and water. 

LLB: Enduro's most popular seal type, this is a Nitrile material rubber with a steel insert. Rather than the standard 2RS type seal, this design goes a step further by machining a groove into the inner race where the seal can rotate with better efficiency and less rolling resistance. Rather than one thick seal lip rubbing on a blunt surface, LLB type utilizes two razor thin sealing lips riding in the groove with light contact. The outside lip keeps the water and contaminates out, while the inner seal retains the grease for smooth function and long intervals between servicing. 

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