Bear attacks usually occur when people stumble into the domain of a bear, especially one that is guarding a fresh kill or a sow with cubs.

In this terrifying GoPro video posted on YouTube, an enormous grizzly chases a man on a bicycle. Even huge bears can burst to 35 miles per hour for short distances. It appears the biker is getting away until there’s a log in the road.

Tell us what you think. Is this the real deal? Sound off in the comments section below.

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Joe Byers has more than 1,000 magazine articles in print and is currently a field editor with Whitetail Journal, Predator Xtreme, Whitetails Unlimited, Crossbow Revolution, and African Hunting Journal magazines. He’s spent the last three decades depicting the thrill of the chase and photographing the majesty of all things wild. Byers is a member of the Professional Outdoor Media Association and numerous other professional and conservation organizations.