supermoto / default rider 183 cm
KTM 640 LC4 Supermoto vs KTM 660 SMC ergonomics
KTM 640 LC4 Supermoto and KTM 660 SMC 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
KTM 640 LC4 Supermoto
All contacts reached
KTM 660 SMC
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 KTM 640 LC4 Supermoto lists a 910 mm seat; the KTM 660 SMC lists 909 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 | KTM 640 LC4 Supermoto | KTM 660 SMC |
|---|---|---|
| Seat height | 910 mm | 909 mm |
| Wheelbase | 1,510 mm | 1,509 mm |
| Wet weight | 159 kg | - |
| Displacement | 625 cc | 654 cc |
Posture metrics
Knee angle
- KTM 640 LC4 Supermoto
- Sport (58.2 deg)
- KTM 660 SMC
- Sport (58.2 deg)
Hip angle
- KTM 640 LC4 Supermoto
- Neutral (92.6 deg)
- KTM 660 SMC
- Neutral (92.8 deg)
Elbow angle
- KTM 640 LC4 Supermoto
- Relaxed (143.3 deg)
- KTM 660 SMC
- Relaxed (143.3 deg)
Torso lean
- KTM 640 LC4 Supermoto
- Neutral (12.9 deg)
- KTM 660 SMC
- Neutral (12.9 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 | KTM 640 LC4 Supermoto | KTM 660 SMC |
|---|---|---|
| 158 cm / 5'2" | Tiptoe only | Tiptoe only |
| 167 cm / 5'6" | Tiptoe only | Tiptoe only |
| 176 cm / 5'9" | Tiptoe only | Tiptoe only |
| 184 cm / 6'0" | Balls of feet | Balls of feet |
| 193 cm / 6'4" | Balls of feet | Balls of feet |
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
KTM 640 LC4 Supermoto and KTM 660 SMC are both supermoto 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 KTM 640 LC4 Supermoto from KTM 660 SMC 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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