cafe-racer / default rider 183 cm
BMW R100S vs BMW R90S ergonomics
BMW R100S and BMW R90S 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
BMW R100S
All contacts reached
BMW R90S
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 BMW R100S lists a 820 mm seat; the BMW R90S lists 818 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 | BMW R100S | BMW R90S |
|---|---|---|
| Seat height | 820 mm | 818 mm |
| Wheelbase | 1,466 mm | 1,466 mm |
| Wet weight | 220 kg | 215 kg |
| Displacement | 980 cc | 898 cc |
Posture metrics
Knee angle
- BMW R100S
- Sport (58.1 deg)
- BMW R90S
- Sport (58.1 deg)
Hip angle
- BMW R100S
- Neutral (93.6 deg)
- BMW R90S
- Neutral (93.6 deg)
Elbow angle
- BMW R100S
- Relaxed (143.3 deg)
- BMW R90S
- Relaxed (143.3 deg)
Torso lean
- BMW R100S
- Neutral (12.3 deg)
- BMW R90S
- Neutral (12.3 deg)