Inflatable water bike conversion kit.
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More: https://www.shuttlebike.com/en/
Previously:
https://www.homemadetools.net/forum/...492#post135776
https://www.homemadetools.net/forum/...809#post140265
https://www.homemadetools.net/forum/...495#post139265
https://www.homemadetools.net/forum/...183#post134668
https://www.homemadetools.net/forum/...610#post128369
https://www.homemadetools.net/forum/...168#post126187
https://www.homemadetools.net/forum/...306#post138800