If straight-line speed is your priority, the RS 660 takes the lead. With 54 HP more than the 450SRS, it offers a more spirited ride that will be noticeable on highway overtakes or track days. Both bikes share a similar footprint on the scale, with only a negligible 4kg difference between them, so handling characteristics will depend more on center-of-gravity than raw weight. Riders with a shorter inseam should lean towards the 450SRS. Its seat height is 25mm lower than the RS 660, 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 | 450SRS |
|---|---|---|
| Displacement | 659 | 449.5 |
| Power | 100 | 46 |
| Cylinders | 2 | 2 |
| Weight | 183 | 179 |
| Seat height | 820 | 795 |
| MSRP (EU) | 11599 | 6890 |