dual-sport / default rider 183 cm
Beta Motor Alp 4.0 vs BMW G 650 GS Sertao ergonomics
Beta Motor Alp 4.0 and BMW G 650 GS Sertao 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
BMW G 650 GS Sertao
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 BMW G 650 GS Sertao lists 861 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 | BMW G 650 GS Sertao |
|---|---|---|
| Seat height | 864 mm | 861 mm |
| Wheelbase | 1,440 mm | 1,484 mm |
| Wet weight | - | 193 kg |
| Displacement | 350 cc | 652 cc |
Posture metrics
Knee angle
- Beta Motor Alp 4.0
- Sport (67.5 deg)
- BMW G 650 GS Sertao
- Sport (67.5 deg)
Hip angle
- Beta Motor Alp 4.0
- Neutral (107.9 deg)
- BMW G 650 GS Sertao
- Neutral (107.1 deg)
Elbow angle
- Beta Motor Alp 4.0
- Relaxed (143.3 deg)
- BMW G 650 GS Sertao
- Relaxed (143.3 deg)
Torso lean
- Beta Motor Alp 4.0
- Neutral (6.4 deg)
- BMW G 650 GS Sertao
- Neutral (7.0 deg)