Shimano Hollowtech II BSA Threaded Bottom Bracket for Mountain & Trekking Bikes

himano BB-MT501 Bottom Bracket – BSA 68/73mm Hollowtech II (OEM, No Retail Box)

Description:
The Shimano BB-MT501 is the next-generation Hollowtech II bottom bracket, built for smoother rotation and better sealing than the SM-BB52. It delivers efficient power transfer and improved durability for mountain, trekking, and e-bike applications. Ideal for riders seeking low friction and long service life in all conditions.

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

Key Features:

• Model: BB-MT501

• Type: External Bottom Bracket (Hollowtech II)

• Thread: BSA (English 1.37” × 24 TPI)

• Shell Width: 68 mm / 73 mm

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

• Sealing: Enhanced labyrinth & contact seals for superior dust and water resistance

• Material: Lightweight aluminium cups with sealed cartridge bearings

• Color: Black

• Weight: Approx. 82 g

Package Includes:

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

• Center sleeve

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

• Inner O-rings

Compatibility:

• Fits Shimano Hollowtech II MTB and Trekking cranksets (e.g. FC-M5100, M6100, M7100, M8100, M8120 series)

• For frames with BSA threaded shells only (not Press-Fit types)

Installation Tips:

• For 68 mm shells: 2 spacers drive side + 1 non-drive.

• For 73 mm shells: 1 spacer drive side only.

• Apply grease and tighten to Shimano specified torque.