Gerloff set the fifth-quickest time in the two-day test at the Spanish circuit, trailing only reigning champion Toprak Razgatlioglu among the Yamaha contingent as the Japanese manufacturer trialed an upgraded version of the title-winning R1.
The 26-year-old racked up nearly 150 laps across the two days of testing, even completing some crucial wet running ahead of his third season in the production-based category.
