standard / default rider 183 cm
Triumph Bonneville T120 vs Yamaha XJ550 Seca ergonomics
Triumph Bonneville T120 has the higher modeled posture score (100 vs 95) for the 183 cm default rider compared with Yamaha XJ550 Seca. Treat this as a planning estimate, not a comfort or purchase verdict; compare the source confidence and confirm both bikes in person.
Modeled fit comparison
Triumph Bonneville T120
All contacts reached
Yamaha XJ550 Seca
All contacts reached
Triumph Bonneville T120 scores higher for the 183 cm default rider in this model. 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 Triumph Bonneville T120 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 | Triumph Bonneville T120 | Yamaha XJ550 Seca |
|---|---|---|
| Seat height | 790 mm | 790 mm |
| Wheelbase | 1,450 mm | 1,405 mm |
| Wet weight | 236 kg | 205 kg |
| Displacement | 1,200 cc | 528 cc |
Posture metrics
Knee angle
- Triumph Bonneville T120
- Neutral (83.6 deg)
- Yamaha XJ550 Seca
- Sport (58.0 deg)
Hip angle
- Triumph Bonneville T120
- Neutral (113.7 deg)
- Yamaha XJ550 Seca
- Neutral (95.0 deg)
Elbow angle
- Triumph Bonneville T120
- Relaxed (143.3 deg)
- Yamaha XJ550 Seca
- Relaxed (143.3 deg)
Torso lean
- Triumph Bonneville T120
- Neutral (14.8 deg)
- Yamaha XJ550 Seca
- Neutral (11.4 deg)