motocross / default rider 183 cm
CZ 400 MX Type 981 vs Yamaha YZ80 ergonomics
CZ 400 MX Type 981 and Yamaha YZ80 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
CZ 400 MX Type 981
All contacts reached
Yamaha YZ80
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 CZ 400 MX Type 981 lists a 836 mm seat; the Yamaha YZ80 lists 800 mm — a 36 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 YZ80 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 | CZ 400 MX Type 981 | Yamaha YZ80 |
|---|---|---|
| Seat height | 836 mm | 800 mm |
| Wheelbase | 1,390 mm | 1,235 mm |
| Wet weight | - | - |
| Displacement | 400 cc | 83 cc |
Posture metrics
Knee angle
- CZ 400 MX Type 981
- Sport (57.9 deg)
- Yamaha YZ80
- Sport (57.6 deg)
Hip angle
- CZ 400 MX Type 981
- Neutral (95.4 deg)
- Yamaha YZ80
- Neutral (98.8 deg)
Elbow angle
- CZ 400 MX Type 981
- Relaxed (143.3 deg)
- Yamaha YZ80
- Relaxed (143.3 deg)
Torso lean
- CZ 400 MX Type 981
- Neutral (11.1 deg)
- Yamaha YZ80
- Neutral (8.8 deg)