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It looked like they were testing all kinds of new ways to present info to Supercross fans. Here's a wireless GoPro setup on the starting gate (above)...
...and a set of antennae on top of the helmets of several riders. That's Aaron Plessinger, with his new number 23.
Here's another GoPro wireless transmitter setup, this time on the top of Weston Peick's head.