RKS RZ125 vs Yamaha Finn

The RKS RZ125 (2026) and the Yamaha Finn (2025) 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 RKS RZ125 is a sport bike with 125 cc, 14.5 hp and unlisted weight; the Yamaha Finn is a cub / underbone with 114 cc, unlisted power and 100 kg. Power-to-weight with the rider: 63.8 hp/ton versus no data.

In the simulation the RKS RZ125 covers 0-100 km/h (speedometer) in 13.42 s and the Yamaha Finn in 27.76 s; the RKS RZ125 is quicker by 14.35 s. In the 60-0 km/h brake test, braking distance without the 0.3 s reaction time is 13.1 m for the RKS RZ125 (with ABS) and 18.5 m for the Yamaha Finn (without ABS). The RKS RZ125 stops 5.4 m shorter. The standard 60-0 test is used because one calculated top speed is below 110 km/h. Calculated top speed: 125 km/h (estimated from power and drag) versus 93 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 class-average calibration (no accepted model-specific road test) for both. Missing manufacturer data (power, torque) is estimated by class regression, not measured. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.