scrambler / default rider 183 cm
BSA Motorcycles Thunderbolt vs SWM Silver Vase 440 ergonomics
BSA Motorcycles Thunderbolt and SWM Silver Vase 440 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
BSA Motorcycles Thunderbolt
All contacts reached
SWM Silver Vase 440
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 BSA Motorcycles Thunderbolt lists a 815 mm seat; the SWM Silver Vase 440 lists 815 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 | BSA Motorcycles Thunderbolt | SWM Silver Vase 440 |
|---|---|---|
| Seat height | 815 mm | 815 mm |
| Wheelbase | 1,466 mm | 1,427 mm |
| Wet weight | 185 kg | 165 kg |
| Displacement | 334 cc | 445 cc |
Posture metrics
Knee angle
- BSA Motorcycles Thunderbolt
- Sport (58.1 deg)
- SWM Silver Vase 440
- Sport (58.0 deg)
Hip angle
- BSA Motorcycles Thunderbolt
- Neutral (93.6 deg)
- SWM Silver Vase 440
- Neutral (94.6 deg)
Elbow angle
- BSA Motorcycles Thunderbolt
- Relaxed (143.3 deg)
- SWM Silver Vase 440
- Relaxed (143.3 deg)
Torso lean
- BSA Motorcycles Thunderbolt
- Neutral (12.3 deg)
- SWM Silver Vase 440
- Neutral (11.7 deg)