MR-15267-LLU ABEC5 Enduro Bike Bearing 15x26x7
Two sealing lips on each seal, which ride in a matching groove on the inner race to make a labyrinth seal. The outer sealing lip repels dirt/water while the inner retains grease. These seals essentially form a “hydromatic seal” of grease when in operation, the grease forming a barrier in the groove.
Enduro ABEC-5 Specification:
Grade 5 Chromium Steel Balls
High precision balls are within 5/1,000,000″ round. R-64 hardness, of the highest grade.
52100 High Carbon Chromium Alloy Races
Vacuum de-gassed process for the purest chromium alloy steel, hardened to R-62, extremely tough and very durable. Polished to a mirror finish for ABEC-5 precision and noiseless movement.
Graphite/Nylon Ball Retainers
Nylon with graphite retainers are virtually frictionless while providing constant lubrication.
The ABEC-5 Standard
To meet the ABEC-5 standard, bearing design must pass all tests, which include noise testing at high RPM, extremely close tolerances for I.D. and O.D., roundness of ball, trueness of the races and micro surface finishes of balls and races.