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cranksets

Schlumpf

Gear up by 2.5X with this innovative internally geared bottom-bracket / crankset / spider.

Gear down by 2.5X with this innovative internally geared bottom-bracket / crankset / spider.

Gear up by 60% with this innovative internally geared bottom-bracket / crankset / spider.

Gear up by 2.5X with this innovative internally geared bottom-bracket / crankset / spider.

Gear down by 2.5X with this innovative internally geared bottom-bracket / crankset / spider.

Gear up by 60% with this innovative internally geared bottom-bracket / crankset / spider.

FSA

Gear up by 60% with this internally geared bottom-bracket / crankset / spider.

Pioneered by inventor Florian Schlumpf, internally geared bottom bracket cranksets integrate the bottom bracket with the crankset and a planetary gear system. This system encloses the gearing for protection from the elements and can be used to eliminate exposed multiple front chainrings.

Recumbent riders innovate raising gearing and cadence with short cranks.