Shimano Deore SM-BB52 BSA Hollowtech II Bottom Bracket for MTB 68/73mm

Shimano SM-BB52 Bottom Bracket – BSA 68/73mm Hollowtech II (OEM, No Retail Box)

Description:
The Shimano SM-BB52 is a dependable bottom bracket built for riders who demand smooth performance and lasting durability. It uses Shimano’s proven Hollowtech II system with high-precision sealed bearings and advanced labyrinth sealing to reduce friction and protect against dust, mud, and water. Ideal for mountain and trekking bikes using 24 mm spindle cranksets.

These are OEM Shimano Parts — Brand New, Never Installed, Never Used, just NOT in Retail Packaging.

Key Features:

• Model: SM-BB52

• Type: Hollowtech II External Bottom Bracket

• Thread Type: BSA (English 1.37" × 24 TPI)

• Shell Width: 68 mm / 73 mm

• Spindle Diameter: 24 mm (for Shimano Hollowtech II cranksets: Deore / SLX / XT / Alivio etc.)

• Sealing System: Shimano Labyrinth + Contact Seal

• Material: Durable aluminum cups with sealed cartridge bearings

• Weight: Approx. 90 g

• Color: Black

Package Includes:

• Left & right bearing cups with bearings installed

• Center sleeve

• 3 × 2.5 mm spacers for shell width adjustment

• Inner O-rings

Compatibility:

• Compatible with all Shimano Hollowtech II MTB, Trekking, and Road cranksets (e.g. FC-M6000, M7000, M8000, M5100, M6100 series).

• Fits standard BSA threaded frames only (not Press-Fit).

Installation Tips:

• For 68 mm shell: install 2 spacers on the drive side + 1 on the non-drive side.

• For 73 mm shell: install 1 spacer on the drive side only.

• Always grease threads and tighten to Shimano’s specified torque.