Segway HT i167
It looks as if it should tip over, yet computers keep moving its wheels back under its rider.
Early Segway HT representative · mayoff · CC BY 2.0
Research pending
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More than a set of wheels.
Dean Kamen's company revealed the Segway Human Transporter in December 2001. Pre-production machines followed in January 2002, and the public could buy them through Amazon beginning that November. This profile is the large first-generation i167, built for longer trips and rougher surfaces than the smaller p133.
Look a little closer.
Its two wheels can rotate in opposite directions, so the i167 can turn around on the spot.
Photos show an example of the model or generation. The pictured vehicle’s year, equipment, or modifications can differ from the specification described here.
Balance by moving, not by standing still
The machine calls its method dynamic stabilization. When the rider's center of gravity moves ahead of the tyres' contact patch, the platform begins to tilt and the wheels drive forward underneath it. The system balances fore-and-aft; the rider still has to keep it upright from side to side.
Source: Segway · first-generation HT Reference Manual ↗Important parts came in pairs
Two controller boards, two battery packs and divided motor circuits gave the balancing system backups. Five rate sensors and two tilt sensors checked the platform's orientation. If the machine found a serious fault, it warned the rider and began a controlled safety shutdown rather than silently carrying on.
Source: Segway · first-generation HT Reference Manual ↗Where these facts come from
- Segway · first-generation HT Reference Manual
- Segway · company timeline
- Accessible transcript of Segway's i167/p133 Reference Manual
Selected facts checked for this edition. Some source pages link to broader model families. Last reviewed September 30, 2026.