Shimano bbr60 bottom bracket for ultegra and 105 with english thread cups
The shimano bbr60 ultegra level bottom bracket english thread cups use shimano hollowtech ii technology which uses a wider outer bearing placement and larger axle diameter for increased stiffness and efficiency while its sealed design has a minimal bearing interface ensuring smooth rolling and increased durability the latest version of hollowtech ii used here is lighter and has 50 lower rotational friction than previous version
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