sport / default rider 183 cm
QJ Motor SRK 421 RR vs Yamaha TRX850 ergonomics
QJ Motor SRK 421 RR and Yamaha TRX850 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
QJ Motor SRK 421 RR
All contacts reached
Yamaha TRX850
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 QJ Motor SRK 421 RR lists a 795 mm seat; the Yamaha TRX850 lists 795 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 | QJ Motor SRK 421 RR | Yamaha TRX850 |
|---|---|---|
| Seat height | 795 mm | 795 mm |
| Wheelbase | 1,385 mm | 1,435 mm |
| Wet weight | 185 kg | - |
| Displacement | 421 cc | 849 cc |
Posture metrics
Knee angle
- QJ Motor SRK 421 RR
- Sport (60.7 deg)
- Yamaha TRX850
- Sport (60.7 deg)
Hip angle
- QJ Motor SRK 421 RR
- Neutral (99.6 deg)
- Yamaha TRX850
- Neutral (99.3 deg)
Elbow angle
- QJ Motor SRK 421 RR
- Relaxed (143.3 deg)
- Yamaha TRX850
- Relaxed (143.3 deg)
Torso lean
- QJ Motor SRK 421 RR
- Forward (25.3 deg)
- Yamaha TRX850
- Forward (25.6 deg)