SHIMANO Splined Hollow Type Bicycle Bottom Bracket – BB-ES300 Review Posted by GiantPandaisy May 19, 2018 in Drivetrain Components BOTTOM BRACKET BB-ES300 SPLINED/HOLLOW-TYPE AXLE Original Shimano parts guarantees that all components work perfectly for optimum performance and maximum safety and longevity. Cycling Outdoor Recreation Parts & Components SHIMANO Sports & Outdoors