RS 660 Extrema 2022 vs ZX-4R 2025

If straight-line speed is your priority, the RS 660 Extrema takes the lead. With 23 HP more than the ZX-4R, it offers a more spirited ride that will be noticeable on highway overtakes or track days. When it comes to agility, the RS 660 Extrema has a clear advantage. Weighing in 9kg less than the ZX-4R, it will feel significantly easier to handle in low-speed traffic, parking maneuvers, and twisty corners. Riders with a shorter inseam should lean towards the ZX-4R. Its seat height is 20mm lower than the RS 660 Extrema, making it much easier to flat-foot at stoplights and increasing confidence during stops. Bottom Line: While both are capable, the rs660 offers a superior power-to-weight ratio, making it the more exciting machine for experienced riders.