The calculator says 255x35x22 increases the circumference 11.9 percent.
http://www.miata.net/garage/tirecalc.html
It will be very unusual. A combination of space frame and chassis rails to keep everything light, but still a large open internal space. Headroom inside will be 1.5 m (legal requirement). The whole thing will be kept as low as possible. One door only, a gull wing on the passenger-side with a short ramp to enter the vehicle. Fiberglas body, touch screen console that is also voice-activated.
I only have a sketch of the finished vehicle at the moment. Still trying to raise funding for the prototype vehicle. They will then be built as a nonprofit organization to keep the cost as low as possible.
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