Mountain Bike Film Tread / Shred or something?

Trying to dig up a film I watched possibly late 80's. Following a couple of guys in the US. I thought it was "Shred" but that brings up snowboarding.
Anybody remember it?

Janners
 
here you go

[youtube]https://www.youtube.com/watch?v=ayt87Iv1OSI[/youtube]
 
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