A direct RS 660 derivative, the Tuono 660 shares the 659cc DOHC parallel-twin at 95 hp Euro 5 and the alu frame, with naked handlebar, KYB shock, and full APRC as standard. The 2022 Factory adds 5 hp via a shorter pinion, full-adj KYB/Sachs suspension, lithium battery, and standard 6-axis IMU.