electric / default rider 183 cm
Alta Motors Redshift SM vs Zero Motorcycles FX ergonomics
Alta Motors Redshift SM and Zero Motorcycles FX 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
Alta Motors Redshift SM
All contacts reached
Zero Motorcycles FX
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 Alta Motors Redshift SM lists a 902 mm seat; the Zero Motorcycles FX lists 881 mm — a 21 mm difference. 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.
On seat height alone, the Zero Motorcycles FX has the easier modeled ground reach. Load your measurements into the simulator to compare the model, then verify both motorcycles in person.
Geometry snapshot
| Spec | Alta Motors Redshift SM | Zero Motorcycles FX |
|---|---|---|
| Seat height | 902 mm | 881 mm |
| Wheelbase | 1,438 mm | 1,438 mm |
| Wet weight | 128 kg | 131 kg |
| Displacement | - | - |
Posture metrics
Knee angle
- Alta Motors Redshift SM
- Sport (58.0 deg)
- Zero Motorcycles FX
- Sport (58.0 deg)
Hip angle
- Alta Motors Redshift SM
- Neutral (94.3 deg)
- Zero Motorcycles FX
- Neutral (94.3 deg)
Elbow angle
- Alta Motors Redshift SM
- Relaxed (143.3 deg)
- Zero Motorcycles FX
- Relaxed (143.3 deg)
Torso lean
- Alta Motors Redshift SM
- Neutral (11.9 deg)
- Zero Motorcycles FX
- Neutral (11.9 deg)