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

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