Shimano SM-BB52 Bottom Bracket – Hollowtech II BSA 68/73mm

Description:
The Shimano SM-BB52 is a high-performance Hollowtech II bottom bracket designed for smooth rotation, maximum durability, and efficient power transfer. Engineered for mountain and trekking use, this bottom bracket ensures long-lasting performance under demanding conditions. It’s compatible with Shimano 24 mm spindle cranksets and fits standard English (BSA) threaded bottom-bracket shells.

Key Features:

  • Model: SM-BB52

  • Type: Hollowtech II External Bottom Bracket

  • Threading: BSA (1.37” × 24 TPI, English thread)

  • Shell Width Compatibility: 68 mm / 73 mm

  • Spindle Diameter: 24 mm (for all Hollowtech II cranks such as Deore, SLX, XT, etc.)

  • Material: High-quality aluminum cups with durable sealed cartridge bearings

  • Sealing: Advanced Shimano Labyrinth + contact sealing for improved water & dirt resistance

  • Weight: Approx. 90 g

  • Color: Black

Included in Package:

  • Left and right bearing cups (with pre-installed bearings)

  • Center sleeve

  • 3 × 2.5 mm spacers (for adjusting 68 mm / 73 mm shell width)

  • Inner O-rings

Compatibility:

  • Suitable for Shimano MTB / Trekking / Road Hollowtech II cranksets (e.g., FC-M6000, M7000, M8000, M5100, M6100, etc.)

  • Works with frames using standard threaded BSA shells (not compatible with Press-Fit systems)

Note:
For a 68 mm shell, install two spacers on the drive side and one on the non-drive side. For a 73 mm shell, install one spacer on the drive side only. Always follow the official Shimano installation torque and grease recommendations.

 

These are OEM Shimano Parts, Brand New, Never Installed on a Bike, Never Used in Any Way, just NOT in the Retail Packaging.

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