cruiser / default rider 183 cm

Triumph Bonneville Bobber vs Triumph Thunderbird Storm ergonomics

Triumph Bonneville Bobber and Triumph Thunderbird Storm 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.

Try with my height

Modeled fit comparison

Triumph Bonneville Bobber

Modeled scoreProvisional

92Comfortable

All contacts reached

Triumph Thunderbird Storm

Modeled scoreProvisional

92Comfortable

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 Triumph Bonneville Bobber lists a 700 mm seat; the Triumph Thunderbird Storm lists 700 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 Triumph Bonneville Bobber and Triumph Thunderbird Storm
Spec	Triumph Bonneville Bobber	Triumph Thunderbird Storm
Seat height	700 mm	700 mm
Wheelbase	1,510 mm	1,615 mm
Wet weight	251 kg	339 kg
Displacement	1,200 cc	1,699 cc

Posture metrics

Knee angle

Triumph Bonneville Bobber: Open (109.1 deg)
Triumph Thunderbird Storm: Open (117.8 deg)

Hip angle

Triumph Bonneville Bobber: Sport (78.5 deg)
Triumph Thunderbird Storm: Sport (79.5 deg)

Elbow angle

Triumph Bonneville Bobber: Relaxed (143.3 deg)
Triumph Thunderbird Storm: Relaxed (143.3 deg)

Torso lean

Triumph Bonneville Bobber: Neutral (8.1 deg)
Triumph Thunderbird Storm: Neutral (9.7 deg)

Fit by rider height

Modeled ground contact by rider height, in 5 bands from 5'2" to 6'4" (158-193 cm).

Modeled foot contact for Triumph Bonneville Bobber and Triumph Thunderbird Storm by rider height
Rider height	Triumph Bonneville Bobber	Triumph Thunderbird Storm
158 cm / 5'2"	Both feet flat	Both feet flat
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

Triumph Bonneville Bobber and Triumph Thunderbird Storm are both cruiser bikes, so the practical question is which of their real differences you'd actually feel. Triumph Bonneville Bobber is about 88 kg lighter wet than Triumph Thunderbird Storm, which tends to show up most when paddling backward out of a parking spot or picking the bike up off the sidestand. Triumph Thunderbird Storm runs a 105 mm longer wheelbase than Triumph Bonneville Bobber, which typically trades some low-speed agility for extra stability at speed. The modeled knee angle differs by 9° between the two, with Triumph Thunderbird Storm opening the knee further — a more stretched-out leg position than Triumph Bonneville Bobber's. None of that adds up to a clear overall winner in the modeled posture score, so the individual differences above are the more useful comparison than the headline number. Treat every figure here as a planning estimate: seat width, suspension sag, footwear, and your own proportions can shift the real feel more than a few millimetres or degrees on paper. Load your height and inseam into the simulator, then sit on both before you decide.

Kit out either bike

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