Reinvented and Reinvigorated for 2023: The 25 Hours of Thunderhill Presented by Hawk Performance!

NASA NorCal is excited to open registration for the 20th running of the epic and long-standing endurance race, the NASA 25 Hours of Thunderhill Presented by Hawk Performance. The race runs on a new weekend this year: Nov. 10-12.
The 25 has been reinvented for 2023, with new classing, revised tire rules, scaled pricing by class, and a streamlined registration process.