This looks to be an offshoot of the 70’s wide world of sports “Superbikes” events that pitted racers from all different disciplines on one track that combined road and dirt.
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Motorcycle Photo Of The Day 
If you didn’t know about this type of racing while operating a motorcycle blog, I’m slack-jawed. Yes, it’s derived from the Superbikers series–use Google to find results for “supermotard” and read up. Why this type of racing isn’t huge in the US is a mystery. Love your blog, I check it daily.
Its not huge here but there is lots of supermotard racing in the US.
This type of racing is gaining popularity in the ol U.S of A.