Shimano 105 BB-5500 Bottom Bracket — 68 × 109.5mm, Octalink V1 (English Threaded)

The Shimano 105 BB-5500 bottom bracket is a precision road component designed for Octalink V1 cranksets, offering smooth bearing performance and long-term reliability for classic Shimano 105 drivetrains.

Featuring a 68mm English-threaded (BSA) shell and 109.5mm spindle length, this bottom bracket is engineered to deliver proper chainline and stiffness when paired with compatible Shimano Octalink V1 road cranksets. It uses sealed cartridge bearings for low maintenance and consistent performance over high mileage.

This model is commonly used as a service replacement on older but still highly capable 105-equipped road bikes, making it ideal for riders maintaining or restoring proven Shimano road setups.

Key Features

• Designed for Shimano Octalink V1 cranksets

• Sealed cartridge bearings for smooth, durable operation

• Optimized chainline with 109.5mm spindle length

• Reliable performance for high-mileage road use

• Ideal replacement for classic Shimano 105 drivetrains

Specifications

• Model: BB-5500

• Shell Width: 68mm

• Spindle Length: 109.5mm

• Interface: Octalink V1

• Threading: English / BSA

Compatibility Notes

• Compatible with Shimano Octalink V1 road cranksets

• ❌ Not compatible with Octalink V2

• ❌ Not compatible with square-taper, Hollowtech II, or press-fit systems

Best For

• Shimano 105 road bikes using Octalink V1

• Replacement of worn or rough bottom brackets

• Riders maintaining classic 9-speed and early 10-speed Shimano road setups