Ribbed bottom bracket for use in sets of plates / Shimano Octalink.

Oversize bottom bracket: the hollow shaft of 22 mm in one piece cold forged chrome reduces weight while increasing strength and stiffness.
Grooved surface of shaft / rod Octalink: rod results in a more rigid compared with square shafts conical.
Cartridge seal with oversized ball bearings: rubber seals, highly efficient and maintenance-free, prevent the entry of dirt, mud and water.
The cartridge design allows easy installation without adjustment.
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MTB