Harley-Davidson Fat Boy vs TVS Jupiter 125

The Harley-Davidson Fat Boy (2025) and the TVS Jupiter 125 (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 Harley-Davidson Fat Boy is a cruiser with 1,923 cc, 103.3 hp and 315 kg; the TVS Jupiter 125 is a scooter with 125 cc, 8.1 hp and unlisted weight. Power-to-weight with the rider: 264.8 hp/ton versus 40.8 hp/ton. On this measure the Harley-Davidson Fat Boy is 550% ahead.

In the simulation the Harley-Davidson Fat Boy covers 0-100 km/h (speedometer) in 3.54 s and the TVS Jupiter 125 in 38.88 s; the Harley-Davidson Fat Boy is quicker by 35.34 s. In the 60-0 km/h brake test, braking distance without the 0.3 s reaction time is 17.7 m for the Harley-Davidson Fat Boy (ABS unknown, class assumption: no ABS) and 17.9 m for the TVS Jupiter 125 (ABS unknown, class assumption: no ABS). The Harley-Davidson Fat Boy stops 0.2 m shorter. The standard 60-0 test is used because one calculated top speed is below 110 km/h. Calculated top speed: 201 km/h (estimated from power and drag) versus 91 km/h (manufacturer claim).

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 the Harley-Davidson Fat Boy and model-specific parameters calibrated against published road tests for the TVS Jupiter 125. Missing manufacturer data (weight) 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.