And now we have the Polaris Slingshot . Right up front, the company warns—no doubt at the behest of sweaty-palmed lawyers on staff—that the Slingshot is not an automobile; it's a three-wheeled motorcycle. We often joke that some bikes are big and heavy enough to be cars, but the Slingshot actually is. Its curb weight is listed as 1,743 pounds, wheelbase as 105 inches, and the engine is a 2,384cc auto-based inline-four. Between it and the single rear wheel is a five-speed, non-sequential manual transmission. I had a first-generation Mazda Miata, which is by a long shot the most fun cage I've owned, with my beloved Honda CRX Si a close second. Compared to the Slingshot, the early Miata was nearly 16 inches shorter in wheelbase, had just a 1.6-liter engine, and weighed a remarkable 2,100 pounds. Like the Miata, the Slingshot has a steering wheel.