Shimano BB-ES300 Octalink bottom bracket - for MTB and Touring

The Shimano BB-ES300 Octalink bottom bracket with 8-speed gears fits MTB and touring cranks installed in BSA bottom brackets with 68 or 73 mm shell width. Compared to its predecessor the BB-ES25, it can save up to 25 grams of weight. This is the standard version, which is not compatible with E-Type or chain cases.

Compatibility:
Octalink crank arms with eight-speed splines for longer grooves (Octalink MTB)

Features:

• hollow construction
• stiff and lightweight for efficient power transmission
• robust construction with reinforced ribs
• 26g lighter than BB-ES25
• fast and precise installation
• good control of the chainline with chain fixation

Octalink Technology:
In Shimano's Octalink system, the bottom bracket and crank are connected by an 8-tooth contact surface. This provides greater rigidity and greater load capacity, especially compared to conventional square systems.

Specifications:

• Application: All Mountain, Touring, City
• Type: BSA
• Shell Width: 73 mm
• Axle Length: 113mm
• Axle Type: Octalink (MTB)
• E-Type Compatibility: No
• Chaincase Compatibility: No