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BMX riders can show flair off the bike, too.
Riders in the Olympics can't wear helmets that display logos or names of non-official partners. Most like Connor Fields and Brooke Crain of the United States have helmets specially made for the Summer Games.
Here's a peek at Fields' new lid:
Brooke Crain, of Visalia, California, saluted her hometown.
The United States' BMX team arrives later this week, with competition beginning next week. Fields and Crain, along with Alise Post, Corben Sharrah and Nic Long comprise a strong American field.