scooter / default rider 183 cm
Vespa 946 vs Yamaha XMAX 400 ergonomics
Vespa 946 and Yamaha XMAX 400 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
Vespa 946
All contacts reached
Yamaha XMAX 400
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 Vespa 946 lists a 805 mm seat; the Yamaha XMAX 400 lists 800 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 XMAX 400 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 | Vespa 946 | Yamaha XMAX 400 |
|---|---|---|
| Seat height | 805 mm | 800 mm |
| Wheelbase | 1,405 mm | 1,567 mm |
| Wet weight | 157 kg | 210 kg |
| Displacement | 150 cc | 395 cc |
Posture metrics
Knee angle
- Vespa 946
- Sport (58.0 deg)
- Yamaha XMAX 400
- Sport (58.3 deg)
Hip angle
- Vespa 946
- Neutral (95.0 deg)
- Yamaha XMAX 400
- Neutral (91.5 deg)
Elbow angle
- Vespa 946
- Relaxed (143.3 deg)
- Yamaha XMAX 400
- Relaxed (143.3 deg)
Torso lean
- Vespa 946
- Neutral (11.4 deg)
- Yamaha XMAX 400
- Neutral (13.7 deg)