motocross / default rider 183 cm
Yamaha YZ250 vs Yamaha YZ490 ergonomics
Yamaha YZ250 and Yamaha YZ490 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
Yamaha YZ250
All contacts reached
Yamaha YZ490
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 Yamaha YZ250 lists a 950 mm seat; the Yamaha YZ490 lists 950 mm, within a few millimetres of each other. 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.
Geometry snapshot
| Spec | Yamaha YZ250 | Yamaha YZ490 |
|---|---|---|
| Seat height | 950 mm | 950 mm |
| Wheelbase | 1,480 mm | 1,475 mm |
| Wet weight | - | - |
| Displacement | 246 cc | 487 cc |
Posture metrics
Knee angle
- Yamaha YZ250
- Sport (58.1 deg)
- Yamaha YZ490
- Sport (58.1 deg)
Hip angle
- Yamaha YZ250
- Neutral (93.3 deg)
- Yamaha YZ490
- Neutral (93.5 deg)
Elbow angle
- Yamaha YZ250
- Relaxed (143.3 deg)
- Yamaha YZ490
- Relaxed (143.3 deg)
Torso lean
- Yamaha YZ250
- Neutral (12.5 deg)
- Yamaha YZ490
- Neutral (12.4 deg)