bagger / default rider 183 cm
BMW R 18 B vs BMW R 18 Roctane ergonomics
BMW R 18 B and BMW R 18 Roctane 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 R 18 B
All contacts reached
BMW R 18 Roctane
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 R 18 B lists a 719 mm seat; the BMW R 18 Roctane lists 719 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 R 18 B | BMW R 18 Roctane |
|---|---|---|
| Seat height | 719 mm | 719 mm |
| Wheelbase | 1,694 mm | 1,720 mm |
| Wet weight | 398 kg | 374 kg |
| Displacement | 1,802 cc | 1,802 cc |
Posture metrics
Knee angle
- BMW R 18 B
- Open (113.8 deg)
- BMW R 18 Roctane
- Open (115.6 deg)
Hip angle
- BMW R 18 B
- Sport (80.2 deg)
- BMW R 18 Roctane
- Sport (80.4 deg)
Elbow angle
- BMW R 18 B
- Relaxed (143.3 deg)
- BMW R 18 Roctane
- Relaxed (143.3 deg)
Torso lean
- BMW R 18 B
- Neutral (8.7 deg)
- BMW R 18 Roctane
- Neutral (9.1 deg)