If straight-line speed is your priority, the Ninja ZX-6R takes the lead. With 50 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 ZX-4R has a clear advantage. Weighing in 9kg less than the Ninja ZX-6R, 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 30mm lower than the Ninja ZX-6R, making it much easier to flat-foot at stoplights and increasing confidence during stops. Bottom Line: While both are capable, the zx6r offers a superior power-to-weight ratio, making it the more exciting machine for experienced riders.
| Spec | ZX-4R | Ninja ZX-6R |
|---|---|---|
| Displacement | 399 | 636 |
| Power | 77 | 127 |
| Cylinders | 4 | 4 |
| Weight | 189 | 198 |
| Seat height | 800 | 830 |
| MSRP (US) | 8999 | 11599 |