686-LLU BO Enduro Bike Bearing Abec 3 6x13x5
BO (Black Oxide) bearings get an additional Magnetite treatment for hardness, rust resistance and even more reliability.
Enduro Abec 3 Specification:
Rubber seals:
- "LLB" is a double-lip type seal making light contact and also rides in a groove making a labyrinth seal.
- "LLU" is a double- lip type seal making medium contact and also rides in a groove making a labyrinth seal.
Grade 10 Chromium Steel Balls:
High precision balls are within 10/1,000,000″ round, twice as round as the industry standard, at it’s highest level.
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-3 precision and noiseless movement.
Riveted Steel Retainer for toughness, ABEC-3 tolerances and noise tested, C-3 or C-N Internal Clearance
