standard / default rider 183 cm
Yamaha RD400 vs Yamaha XS650 ergonomics
Yamaha RD400 and Yamaha XS650 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
Yamaha RD400
All contacts reached
Yamaha XS650
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 Yamaha RD400 lists a 800 mm seat; the Yamaha XS650 lists 800 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 | Yamaha RD400 | Yamaha XS650 |
|---|---|---|
| Seat height | 800 mm | 800 mm |
| Wheelbase | 1,334 mm | 1,435 mm |
| Wet weight | 165 kg | - |
| Displacement | 399 cc | 654 cc |
Posture metrics
Knee angle
- Yamaha RD400
- Sport (57.8 deg)
- Yamaha XS650
- Sport (58.0 deg)
Hip angle
- Yamaha RD400
- Neutral (96.5 deg)
- Yamaha XS650
- Neutral (94.3 deg)
Elbow angle
- Yamaha RD400
- Relaxed (143.3 deg)
- Yamaha XS650
- Relaxed (143.3 deg)
Torso lean
- Yamaha RD400
- Neutral (10.3 deg)
- Yamaha XS650
- Neutral (11.8 deg)