If straight-line speed is your priority, the RS 660 Extrema takes the lead. With 55 HP more than the Ninja 400, it offers a more spirited ride that will be noticeable on highway overtakes or track days. When it comes to agility, the Ninja 400 has a clear advantage. Weighing in 12kg less than the RS 660 Extrema, 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 Ninja 400. Its seat height is 35mm 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.
| Spec | RS 660 Extrema | Ninja 400 |
|---|---|---|
| Displacement | 659 | 399 |
| Power | 100 | 45 |
| Cylinders | 2 | 2 |
| Weight | 180 | 168 |
| Seat height | 820 | 785 |