When you look at the frame tube between the driver and the passenger on the 2020 Slingshot R, you’ll find a sticker that says, “This is a motorcycle.” Now, by our standards, it is not a motorcycle, as it doesn’t lean—that’s the standard handed down by my boss. We agree that the Yamaha Niken is a motorcycle with three wheels, as it is quite adept at leaning. Yet, we’re allowing the Slingshot R onto our pages, as it is at least motorcycle-adjacent, and it can serve as a feeder from the four-wheel world to a life on two wheels.
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https://ultimatemotorcycling.com/2020/12/07/2020-slingshot-r-review-12-fast-facts-on-3-wheels/