- dual 700c wheels
- road bike level components
- high(ish) rider height because a lot of people like that
- alloy construction for economy and the ability to mass produce
- compact overall length
Its the best I can do given those criteria, which by the way, are intended to make this bike usable, practical and affordable.
If we went to one-off carbon fiber construction and stuck the rider way low down, then I guess it would be faster and lighter. But it wouldn’t be such a complex design problem.