Shimano Hollowtech II Threaded Bottom Bracket BSA 68/73mm BB-MT501

Shimano BB-MT501 Bottom Bracket – Hollowtech II BSA 68/73mm (OEM, Not in Retail Packaging)

Description:
The Shimano BB-MT501 is a high-quality Hollowtech II bottom bracket engineered for optimal power transfer, smooth rotation, and long-lasting durability. Designed for modern mountain and trekking bikes, it features upgraded sealing and bearing performance compared to the previous SM-BB52, providing better protection against dirt, water, and wear.

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

Key Features:

• Model: BB-MT501

• 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 Shimano Hollowtech II cranksets such as Deore, SLX, XT, etc.)

• Sealing: Advanced double-lip & labyrinth design for excellent dirt and water resistance

• Material: Aluminum alloy cups with precision-sealed cartridge bearings

• Weight: Approx. 82 g

• Color: Black

Package Includes:

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

• Center sleeve

• 3 × 2.5 mm spacers for shell width adjustment

• Inner O-rings

Compatibility:

• Compatible with all Shimano Hollowtech II MTB and Trekking cranksets (e.g., FC-M5100, M6100, M7100, M8100, M8120, etc.)

• Fits frames with standard BSA (English) threaded bottom-bracket shells

• Not compatible with Press-Fit (BB-MT500-PA) frames

Installation Note:

• For 68 mm shells: use two spacers on the drive side and one on the non-drive side.

• For 73 mm shells: use one spacer on the drive side only.

• Apply grease to threads and follow Shimano torque specifications for best performance.