Honda CBR650R vs RKS RZ125

The Honda CBR650R (2025) and the RKS RZ125 (2026) are compared with the same Moto Kıyas physics model under identical conditions: flat dry asphalt, no wind, a 75 kg rider and no passenger. The Honda CBR650R is a sport bike with 649 cc, 93.9 hp and 211 kg; the RKS RZ125 is a sport bike with 125 cc, 14.5 hp and unlisted weight. Power-to-weight with the rider: 328.2 hp/ton versus 63.8 hp/ton. On this measure the Honda CBR650R is 414% ahead.

In the simulation the Honda CBR650R covers 0-100 km/h (speedometer) in 3.33 s and the RKS RZ125 in 13.42 s; the Honda CBR650R is quicker by 10.08 s. In the 100-0 km/h brake test, braking distance without the 0.3 s reaction time is 36.4 m for the Honda CBR650R (with ABS) and 36.4 m for the RKS RZ125 (with ABS). Calculated top speed: 220 km/h (manufacturer claim) versus 125 km/h (estimated from power and drag).

All values are an estimated simulation, not road-test measurements. Technical data comes from the sources listed below; the model uses model-specific parameters calibrated against published road tests for the Honda CBR650R and class-average calibration (no accepted model-specific road test) for the RKS RZ125. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.