standard / default rider 183 cm
Suzuki GS 400 vs Yamaha XS400 ergonomics
Suzuki GS 400 and Yamaha XS400 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.
Posture overlay
The default rider's modeled seated posture on each bike, solved from the same geometry as the score panels and overlaid on one ground line so seat height and reach differences are visible at a glance.
Modeled fit comparison
Suzuki GS 400
All contacts reached
Yamaha XS400
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 Suzuki GS 400 lists a 780 mm seat; the Yamaha XS400 lists 780 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 | Suzuki GS 400 | Yamaha XS400 |
|---|---|---|
| Seat height | 780 mm | 780 mm |
| Wheelbase | 1,384 mm | 1,364 mm |
| Wet weight | 185 kg | 182 kg |
| Displacement | 398 cc | 391 cc |
Posture metrics
Knee angle
- Suzuki GS 400
- Sport (57.9 deg)
- Yamaha XS400
- Sport (57.9 deg)
Hip angle
- Suzuki GS 400
- Neutral (95.4 deg)
- Yamaha XS400
- Neutral (95.8 deg)
Elbow angle
- Suzuki GS 400
- Relaxed (143.3 deg)
- Yamaha XS400
- Relaxed (143.3 deg)
Torso lean
- Suzuki GS 400
- Neutral (11.1 deg)
- Yamaha XS400
- Neutral (10.8 deg)
Fit by rider height
Modeled ground contact by rider height, in 5 bands from 5'2" to 6'4" (158-193 cm).
| Rider height | Suzuki GS 400 | Yamaha XS400 |
|---|---|---|
| 158 cm / 5'2" | Balls of feet | Balls of feet |
| 167 cm / 5'6" | Both feet flat | Both feet flat |
| 176 cm / 5'9" | Both feet flat | Both feet flat |
| 184 cm / 6'0" | Both feet flat | Both feet flat |
| 193 cm / 6'4" | Both feet flat | Both feet flat |
Modeled from each bike's seat height and a typical inseam-to-height ratio only — not a flat-footing guarantee. Real ground contact still depends on seat shape, suspension sag, footwear, and your own proportions. Confirm on the motorcycle.
Verdict
Suzuki GS 400 and Yamaha XS400 are both standard bikes, so the practical question is which of their real differences you'd actually feel. On seat height, wheelbase, wet weight, and the modeled knee, torso-lean, and posture-score deltas, this pair sits inside the range where two bikes fit alike for a given rider — nothing here clears a difference most riders would notice from the saddle. That is a legitimate result, not a missing analysis: some same-category neighbors really are interchangeable on paper. The honest takeaway is to let other factors decide — running costs, service network, styling, availability — because ergonomics alone won't separate Suzuki GS 400 from Yamaha XS400 for most riders. Load your own height and inseam into the simulator below to see whether your specific proportions turn up a difference the class averages hide, then confirm both bikes in person before you commit.
Kit out either bike
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