Enduro ABEC5 Bottom Bracket BB90 to GXP

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Designed for Trek BB90 bracket shells when using a SRAM GXP crankset.

Angular Contact Series
This new addition to the Enduro line reflects the need for adjusting the play out of wheels, especially with disc brakes on roadbikes. The hubs require a preload feature in order to utilize these bearings. We now have wave washers in fitments section
-These bearings are made with a 15 degree contact angle -They are dimensionally the same as the 61xxx series bearings -They are all ABEC-5 Quality Bearings
-Load side on RED seal side; .5-1 NM preload required

Grade 5 Chromium Steel Balls:
High precision balls are within 5/1,000,000′′ round. These are military level specification, used for precision equipment. R-64 hardness, of the highest grade.
52100 High Carbon Chromium Alloy Races:
Vacuum de-gassing 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.
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. All ABEC 5 bearings are filled both sides with Kluber Isoflex grease.

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