If you go to a professional stunt event or even scroll through competition clips online, you'll notice that the bikes often have a dented gas tank. Now, it's easy to think that's a flaw from a crash.

RAPID CITY, S.D. (KOTA) - The Thunderdome in Sturgis hosted Pinned Industries’s first annual motorcycle stunt competition in the city of riders Saturday night. “We’ve been doing this since January, ...