Movies revolving around extreme sports are a lot like movies that involve superheroes. There were the first couple that worked — and an entire crop of films hastily thrown together to cash in on a trend, fad or target audience.

Need proof? See “Supercross.”

“Supercross” is the latest advertising-saturated, X games generation-friendly movie that documents the unlikely rise of two nitwits, filled to the brim with character cliches and unbelievable one-liners, to extreme-sports royalty.

Of course, that’s what everyone should have been expecting. In fact, anyone expecting a piece of art should probably stop watching movies altogether — forever. That’s why, for the purpose of this review, I sat down with an actual motocross rider to get his reaction on how the film tackled the technical aspect of the sport (and, so I had someone to laugh with as the story unfolded in the empty theater).

“Supercross” is basically the plot of pretty much every bland sports movie ever, rolled into one painfully predictable, poorly executed mess. The story revolves around the good-looking, gearheaded underdog brothers K.C. and Trip Carlyle, who have their sights set on recklessly taking their unexplained natural talent all the way to the top.

After watching about 15 minutes of this uninspired cliche, it becomes clear exactly where the story is headed — for a complete wipeout.

Unexpectedly, the film’s practice of inserting every film cliche possible is actually one of its true merits. Director Steve Boyum, who has more experience as a stunt coordinator than director, had the good sense to know his audience was going to be able to connect the dots and left out most of the plot-driven scenes that would have developed his laughable cast.

Even though important scenes are left out, the audience can assume they happened only through their knowledge of other, similar movies and by references made to them by the characters.

We were thrilled some seemingly crucial scenes were excluded based on how bad the scenes that did make it into the film were. Even then, those painful scenes are only a loose thread used to connect the scenes that audiences are undoubtedly hungry for — high-speed, two-wheeled mayhem.

It would be interesting to know for sure, but it seems like the characters spend more screen time scooting around than anything else. The overload of race footage, although over the top, is undeniably the film’s strong suit for two reasons.

One, it keeps the characters from having dialogue and two, it’s the only thing the film does somewhat accurately.

In the opinion of my viewing companion, the film does a good job of portraying the scene at a motocross race in terms of what goes on behind the scenes, in addition to things that happen on the track.

Although, I did notice him wincing in pain as the loose cannon of the fraternal duo, Trip, pulls a random, unnecessary wheelie around a corner. Other technical aspects struck him as far-fetched and unlikely, but, in the end, he was satisfied by the way the film tackled the sport.

Overall, not even the film’s technical accuracy can save it from its deplorable acting and insulting writing, which gave it the tone of a poorly written Fox sitcom, let alone a Fox major motion picture.

The movie was clearly made to appeal simply to motocross enthusiasts and high school kids who think they are. Anyone who can do without emotionless storytelling and soul-stealing product placement steer clear — no pun intended.