ABEC-5 Radial Bottom Bracket bearing constructed with 52100 High-Carbon Chromium alloy races and premium grade 5 balls at 90% fill capacity. Features strategic seal configuration with robust gray LLU seals facing outward to defend against environmental contaminants, while lower-friction black LLB seals face inward to optimize grease retention. Engineered specifically for bicycle applications with high-pressure, water-resistant grease to ensure superior performance under demanding conditions.
This precision bearing serves primarily as a direct replacement component for Shimano external-cup bottom bracket systems utilizing 24mm outer diameter spindle cranksets. Engineered to meet exact OEM specifications, it provides optimal compatibility and performance restoration for these widely-deployed drivetrain configurations.
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