Blackbearing Bearing B3 R4-2RsFeatures OEM Compatible Design: Precisely manufactured to match original equipment standards, ensuring seamless fitment and easy installation on most bicycles. High Grade Chrome Steel Construction: SAE52100 chrome steel balls, rings and cage deliver superior hardness, wear resistance and consistent strength. Double Sealed Protection: Equipped with 2RS seals that effectively block dust, water and debris while maintaining internal lubrication for
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