Six-time champion Rea, who has made the transition from Kawasaki to replace BMW-bound Toprak Razgatlioglu, turned 12 laps aboard the R1 he will race in 2024 on a rain-affected opening day of testing.
He posted a best time of 1m40.302s to go fourth-fastest, a little under half a second shy of pacesetter Remy Gardner, although his day was interrupted by a crash at Turn 13.
