MR-21531-2RS Enduro Bike Bearing Abec 3 21.5x31x7

MR-21531-2RS Enduro Bike Bearing Abec 3 21.5x31x7

Enduro Abec 3 Specification:

Rubber seals - usually blue:

• "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