Five of the top riders in the MotoAmerica Superbike Championship are midway through the opening day of a two-day test at Thunderhill Raceway Park in Willows, California. Those in attendance are the Yoshimura Suzuki team of Toni Elias and Josh Herrin; three-time MotoAmerica Superbike Champion Cameron Beaubier and his Monster Energy Yamaha teammate Garrett Gerloff; and the Estenson Racing/Attack Performance’s one-man team of JD Beach.

The following photos are from the lens of MotoAmerica photographer Brian J. Nelson.

Josh Herrin took to Thunderhill track today in what was his first multi-team test of the Yoshimura Suzuki.
JD Beach was one of the first on track this morning in Northern California.
Toni Elias styles for the lens of Brian J. Nelson at Thunderhill.
MotoAmerica Superbike rookie and two-time Supersport Champion JD Beach contemplates the Estenson Racing/Attack Performance Yamaha.
Garrett Gerloff at speed on the Monster Energy Yamaha.