BMW R 1300 RT vs Harley-Davidson Fat Boy

The BMW R 1300 RT (2026) and the Harley-Davidson Fat Boy (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 BMW R 1300 RT is a touring bike with 1,300 cc, 143.5 hp and 281 kg; the Harley-Davidson Fat Boy is a cruiser with 1,923 cc, 103.3 hp and 315 kg. Power-to-weight with the rider: 403.1 hp/ton versus 264.8 hp/ton. On this measure the BMW R 1300 RT is 52% ahead.

In the simulation the BMW R 1300 RT covers 0-100 km/h (speedometer) in 3.37 s and the Harley-Davidson Fat Boy in 3.54 s; the BMW R 1300 RT is quicker by 0.17 s. In the 100-0 km/h brake test, braking distance without the 0.3 s reaction time is 41.0 m for the BMW R 1300 RT (with ABS) and 49.1 m for the Harley-Davidson Fat Boy (ABS unknown, class assumption: no ABS). The BMW R 1300 RT stops 8.1 m shorter. Calculated top speed: 229 km/h (estimated from power and drag) versus 201 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 BMW R 1300 RT and class-average calibration (no accepted model-specific road test) for the Harley-Davidson Fat Boy. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.