Bike tractor by Wim Michels.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
3:44 video:
More: Biketraktor | Farm Hack
Previously:
Steam engine powered bicycle - photo
Shaft-driven bicycle - video and photo
Early 1900s bicycle ambulance - photo
Bicycle snow plow - GIF
Railroad track bicycle - photo
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