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