motocross / default rider 183 cm
Fantic XX 250 vs Yamaha YZ450F ergonomics
Fantic XX 250 and Yamaha YZ450F have modeled posture scores within three points for the 183 cm default rider. Treat this as a planning estimate; posture preference, data confidence, and a real test sit still matter.
Modeled fit comparison
Fantic XX 250
All contacts reached
Yamaha YZ450F
All contacts reached
The modeled scores are within three points, so the result does not distinguish a higher-scoring bike. Treat the result as a planning estimate and compare each bike's geometry confidence before a real test sit.
Rider fit: reaching the ground
The Fantic XX 250 lists a 970 mm seat; the Yamaha YZ450F lists 965 mm — a 5 mm difference. Seat height is only a first-pass ground-reach input. It does not establish safety or actual foot contact. Seat width, suspension sag, boots, mobility, load, and individual proportions can materially change the result.
On seat height alone, the Yamaha YZ450F has the easier modeled ground reach. Load your measurements into the simulator to compare the model, then verify both motorcycles in person.
Geometry snapshot
| Spec | Fantic XX 250 | Yamaha YZ450F |
|---|---|---|
| Seat height | 970 mm | 965 mm |
| Wheelbase | 1,485 mm | 1,476 mm |
| Wet weight | 98 kg | 110 kg |
| Displacement | 249 cc | 450 cc |
Posture metrics
Knee angle
- Fantic XX 250
- Sport (58.1 deg)
- Yamaha YZ450F
- Sport (58.1 deg)
Hip angle
- Fantic XX 250
- Neutral (93.2 deg)
- Yamaha YZ450F
- Neutral (93.3 deg)
Elbow angle
- Fantic XX 250
- Relaxed (143.3 deg)
- Yamaha YZ450F
- Relaxed (143.3 deg)
Torso lean
- Fantic XX 250
- Neutral (12.5 deg)
- Yamaha YZ450F
- Neutral (12.4 deg)