Surf Bike.

[J.A.W.]

Swinecar a bit too wheelchair-like for you?
Try Surf Biking..
Robbie Maddison pumps his big 2-stroke MXer - on the pipe..

https://www.youtube.com/watch?v=lDi9uFcD7XI

[Andres125sx]

Crazy!

I wonder how many bikes did they sink before finishing the video tough

[J.A.W.]

I didn't see an ankle line attached.. as regular surfboards carry..

But 'crazy' - nah, he's a skilled stunter, & a sportsman, but def' not mentally deranged..

[Andres125sx]

I was refering to the concept, not the rider

[RicME85]

Better than Guy Martin's effort