supermoto / default rider 183 cm
Derbi Senda DRD X-Treme 50 SM vs Yamaha XT660X ergonomics
Derbi Senda DRD X-Treme 50 SM and Yamaha XT660X 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
Derbi Senda DRD X-Treme 50 SM
All contacts reached
Yamaha XT660X
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 Derbi Senda DRD X-Treme 50 SM lists a 865 mm seat; the Yamaha XT660X 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 | Derbi Senda DRD X-Treme 50 SM | Yamaha XT660X |
|---|---|---|
| Seat height | 865 mm | 865 mm |
| Wheelbase | 1,413 mm | 1,505 mm |
| Wet weight | - | 186 kg |
| Displacement | 50 cc | 660 cc |
Posture metrics
Knee angle
- Derbi Senda DRD X-Treme 50 SM
- Sport (58.0 deg)
- Yamaha XT660X
- Sport (58.2 deg)
Hip angle
- Derbi Senda DRD X-Treme 50 SM
- Neutral (94.9 deg)
- Yamaha XT660X
- Neutral (92.8 deg)
Elbow angle
- Derbi Senda DRD X-Treme 50 SM
- Relaxed (143.3 deg)
- Yamaha XT660X
- Relaxed (143.3 deg)
Torso lean
- Derbi Senda DRD X-Treme 50 SM
- Neutral (11.5 deg)
- Yamaha XT660X
- Neutral (12.8 deg)