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Rider Height
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standard / default rider 183 cm

Royal Enfield Classic 650 vs Yamaha RD400 ergonomics

Royal Enfield Classic 650 and Yamaha RD400 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

Royal Enfield Classic 650

Modeled scoreProvisional
95Comfortable

All contacts reached

Yamaha RD400

Modeled scoreProvisional
95Comfortable

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 Royal Enfield Classic 650 lists a 800 mm seat; the Yamaha RD400 lists 800 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

Geometry comparison for Royal Enfield Classic 650 and Yamaha RD400
SpecRoyal Enfield Classic 650Yamaha RD400
Seat height800 mm800 mm
Wheelbase1,475 mm1,334 mm
Wet weight243 kg165 kg
Displacement649 cc399 cc

Posture metrics

Knee angle

Royal Enfield Classic 650
Sport (58.1 deg)
Yamaha RD400
Sport (57.8 deg)

Hip angle

Royal Enfield Classic 650
Neutral (93.5 deg)
Yamaha RD400
Neutral (96.5 deg)

Elbow angle

Royal Enfield Classic 650
Relaxed (143.3 deg)
Yamaha RD400
Relaxed (143.3 deg)

Torso lean

Royal Enfield Classic 650
Neutral (12.4 deg)
Yamaha RD400
Neutral (10.3 deg)