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Another one from way, way back : I admire the clever buggers that do such things. Couldn't find videos of the French Savard 2X2 - that used a front swingarm with hub centered steering, so, quite limited in dirt use, due to buggerall steering lock. I think they did run it in events like Le Touquet, and other beaches races . They may have campaigned in in some Super Motard / Moto events :

Don't know how many of you that remember the 4wd system that Öhlins developed in the late 90´s and later made it to production in a small series of wr450's. i think it drove like 30% on the front wheel and was also raced in dakar at least one year. It's a fairly simple design with a hydraulic pump and hydrostatic motor in the front hub elemenating the needs for all the chains. Would be fun to see a aftermarket bolt on solution for the bikes.

Pretty coo! The only thing I’m surprised about is that the guy still has all his fingers. Haha