Upgrade your drivetrain with the Shimano SM-BB52. Designed for mountain biking and heavy-duty trekking, this external bottom bracket offers better weight distribution and greater pedaling stability by placing the bearings outside the frame.
Key Performance Features
Hollowtech II Technology: Provides the best balance of stiffness, strength, weight, and rotating performance.
Superior Sealing: Features an improved seal design compared to the previous BB51 model, significantly reducing friction while keeping mud and water out for a longer lifespan.
External Bearing Placement: By positioning the bearings outside the bottom bracket shell, it allows for a wider stance and a larger bearing diameter, increasing rigidity.
Easy Maintenance: The sealed cartridge unit is designed to be maintenance-free and easy to install with a standard 16-notch BB tool.
Installation Tip
Since these are "Mountain" spec units (as labeled on the cups), they are compatible with both 68mm and 73mm bottom bracket shells.
For a 68mm shell: Use two spacers on the drive side (Right) and one on the non-drive side (Left).
For a 73mm shell: Use only one spacer on the drive side (Right).
