Cutaway of a Rohloff Speedhub 500/14 internally geared bicycle hub.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...b_fullsize.jpg
Previously:
Shaft-driven bicycle - video and photo
Chainless bicycle - GIF
Exposed planetary gears in heavy equipment - GIF
Giant gearshaft being quenched - GIF
Direction changing gears GIF
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