Reverse Trike?
Are planning on ending up with a reverse trike, ie, two wheels up front, using the Geo Metro suspension and drive train?
Will you be leaving the wheels under the body or exposing them like the picture you included?
I would leave them under the body and just work on smoothing the flow from front to back.
What will you use for your single rear wheel? If the front wheels are providing turning, power and braking, then I would leave the stock sized Geo Metro wheels there.
I would probably go with a single Geo Metro wheel in the back, but I like consistency and common parts (keep the fourth for a spare!).
If you are making a hybrid or in some way not reducing the weight by much, a wider large wheel might be needed.
Of course, I am not an engineer nor do I play one on TV.
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