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The e-tron Spyder rides on a 95.7-inch wheelbase, which is 8.7 inches shorter than that of the R8. At 159.8 inches long, 71.3 inches wide, and 43.7 inches tall, it's slightly larger than the hardtop e-tron shown in January at the 2010 Detroit Auto Show but still considerably smaller than an Audi TT.
Design-wise, the e-tron Spyder is similar to the Detroit car, but with a more aggressive look thanks to its crisper lines and new fascias. The front fascia has larger, bolder-looking grille elements, while the rear end is completely different.

Audi E Tron Spyder Concept Cars