Honda CB125F vs RKS RZ125

The Honda CB125F (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 CB125F is a naked bike with 124 cc, 10.7 hp and 117 kg; the RKS RZ125 is a sport bike with 125 cc, 14.5 hp and unlisted weight. Power-to-weight with the rider: 55.9 hp/ton versus 63.8 hp/ton. On this measure the RKS RZ125 is 14% ahead.

In the simulation the Honda CB125F covers 0-100 km/h (speedometer) in 21.61 s and the RKS RZ125 in 13.42 s; the RKS RZ125 is quicker by 8.19 s. In the 60-0 km/h brake test, braking distance without the 0.3 s reaction time is 17.3 m for the Honda CB125F (ABS unknown, class assumption: no ABS) and 13.1 m for the RKS RZ125 (with ABS). The RKS RZ125 stops 4.2 m shorter. The standard 60-0 test is used because one calculated top speed is below 110 km/h. Calculated top speed: 100 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 CB125F 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.