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User:Flibbertigibbetry

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This account was created to upload my photo into the public domain because the relevant Wikipedia page needed a photo of a close-up of a retro-direct drivetrain.

The chain loops over two freewheels of different sizes and is pulled taut by a tensioner mounted near the forward end of the chainstay.
Close-up view of a retro-direct drivetrain on a bicycle.
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