The Mazda MX-5 Miata is already a very light car, ranging between 2,332 and 2,381 pounds, depending on your choice of transmission. Sometimes, very light isn't good enough -- that's why the automaker brought two new MX-5 concepts to SEMA that drops the curb weight even further.
The MX-5 Spyder is the first of these two concepts. Similar to how Porsche builds its Boxster Spyder, the MX-5 ditches a convertible top in favor of what it calls a "bikini top." In actuality, it's just a small soft top that's never meant to be a permanent staple -- this car is for open-air cruising and nothing else.
Thanks to the removal of the top mechanism and some lightweight, 17-inch Yokohama wheels, the Spyder's curb weight is down to a respectable 2,301 pounds. The leather interior probably doesn't help that figure, but it does add to the vintage-motoring theme Mazda was going for with this concept.
While the Spyder represents a sensible loss of mass, the MX-5 Speedster goes for broke. Keen eyes will notice several missing components, including any sort of top, and any sort of windshield -- thankfully, concepts don't have to worry about silly things like federal regulations.
In conjunction with carbon-fiber seats and 16-inch Rays wheels, the MX-5 Speedster weighs an astonishing 2,080 pounds. Good luck getting Mazda to sell you one of these. It should go without saying that chopping off your own windshield is not recommended.