dual-sport / default rider 183 cm
Beta Motor Alp 4.0 vs Yamaha XT660R ergonomics
Beta Motor Alp 4.0 and Yamaha XT660R 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
Beta Motor Alp 4.0
All contacts reached
Yamaha XT660R
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 Beta Motor Alp 4.0 lists a 864 mm seat; the Yamaha XT660R lists 865 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 | Beta Motor Alp 4.0 | Yamaha XT660R |
|---|---|---|
| Seat height | 864 mm | 865 mm |
| Wheelbase | 1,440 mm | 1,505 mm |
| Wet weight | - | - |
| Displacement | 350 cc | 660 cc |
Posture metrics
Knee angle
- Beta Motor Alp 4.0
- Sport (67.5 deg)
- Yamaha XT660R
- Sport (67.6 deg)
Hip angle
- Beta Motor Alp 4.0
- Neutral (107.9 deg)
- Yamaha XT660R
- Neutral (106.7 deg)
Elbow angle
- Beta Motor Alp 4.0
- Relaxed (143.3 deg)
- Yamaha XT660R
- Relaxed (143.3 deg)
Torso lean
- Beta Motor Alp 4.0
- Neutral (6.4 deg)
- Yamaha XT660R
- Neutral (7.3 deg)