standard / default rider 183 cm
Yamaha SR400 vs Yamaha XJ550 Seca ergonomics
Yamaha SR400 and Yamaha XJ550 Seca 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 SR400
All contacts reached
Yamaha XJ550 Seca
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 SR400 lists a 790 mm seat; the Yamaha XJ550 Seca lists 790 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 SR400 | Yamaha XJ550 Seca |
|---|---|---|
| Seat height | 790 mm | 790 mm |
| Wheelbase | 1,410 mm | 1,405 mm |
| Wet weight | 174 kg | 205 kg |
| Displacement | 399 cc | 528 cc |
Posture metrics
Knee angle
- Yamaha SR400
- Sport (58.0 deg)
- Yamaha XJ550 Seca
- Sport (58.0 deg)
Hip angle
- Yamaha SR400
- Neutral (94.8 deg)
- Yamaha XJ550 Seca
- Neutral (95.0 deg)
Elbow angle
- Yamaha SR400
- Relaxed (143.3 deg)
- Yamaha XJ550 Seca
- Relaxed (143.3 deg)
Torso lean
- Yamaha SR400
- Neutral (11.5 deg)
- Yamaha XJ550 Seca
- Neutral (11.4 deg)