Shimano Deore SM-BB52 BSA Hollowtech II Mountain Bike Bottom Bracket 68/73mm

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.