> I'm not buying it . The axle on a dirt bike is captured by the forks. At least any I have.
Right. Whoever 'shopped this pic must have figured that most folks have never removed a front wheel from a motorcycle. But most folks have taken off a bicycle wheel, and it IS possible for an unloaded bicycle wheel to fall off. In fact newer bicycle forks have "lawyer lips", which are ridges that prevent the wheel from falling off unless the quick release is really loose.
On all the newer motorcycles I've messed with, the front axle goes through a hole in the right fork, through the hub, then screws into threads in the left fork. Once the axle is screwed in tight, you tighten a pinch bolt on the right fork that prevents the axle from turning.
So... for a front wheel to turn off, the pinch bolt must be loose. That's certainly possible. But then the axle has to unscrew several turn, which is VERY UNLIKELY, because the forward rotation of the wheel will tend to turn the axle CLOCKWISE, making it tighter. And even if the axle did unscrew, it's unlikely it's going to fall out at the instant the rider makes a jump. And none of this explains the mysterious disappearance of the front brake caliper.
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