Shimano BB-ES300 Octalink Bottom Bracket 118/73mm BSA

Durability, high power transfer, and Shimano reliability, all in one.

The Shimano BB-ES300 is a high-quality bottom bracket system designed for Octalink compatible cranksets, offering high rigidity and smooth performance. With a 73mm hub width and 118mm spindle length, it is fully compatible with the BSA (1.37x24) chainring pattern commonly used in MTB, trekking, and city bikes.

Thanks to its Octalink axle design, it offers stronger torque transmission , longer lifespan , and better crankset rigidity compared to square axle systems. With Shimano's factory sealed cartridge bearing structure, maintenance requirements are minimized.

Key Features

✔ Original Shimano Quality

• High durability and long service life.

• Shimano's reliable sealed cartridge hub technology.

✔ Octalink Connection System

• Rigid structure that increases crank-cadence efficiency.

• More robust connection compared to square shaft systems.

✔ Suitable for MTB and Trekking Use

• Ideal for mountain bikes, city bikes, and touring bikes.

• VTT/MTB compatible architecture

✔ BSA (British Standard) Dental Procedure

• Most common compatibility: 1.37” x 24 TPI

• With a hub width of 73 mm, it is suitable for many frames.

✔ Maintenance-free sealed cartridge design

• High protection against water and dust.

• Trouble-free and long-lasting use.

Technical Specifications

• Model: Shimano BB-ES300

• System: Octalink

• Shaft Length: 118 mm

• Frame Hub Width: 73 mm

• Tooth Type: BSA / British / 1.37x24

• Usage Area: MTB, city, trekking

• Bearing Type: Sealed cartridge

• Package Contents: 1 central hub

• EAN: – (Not specified by the manufacturer)

Compatibility

• Octalink compatible Shimano cranksets

• Frames with a 73 mm BSA hub width

• Mountain bikes, city bikes, trekking models