The next Roadster could be one of the quickest cars on the planet.

The next generation of the Tesla Roadster could be the quickest street-legal car on the planet.

Posting on his personal Twitter account, company founder and CEO Elon Musk said that building a car capable of hitting 60 mph from a stop in under two seconds would be "an interesting target." He added the time would only count if the Roadster can log a sub-two second time right off the production line, and fitted with street-legal tires.

It's not the first time Musk has teased us with the next Roadster's impressive performance credentials. Last winter, he promised the car will be quicker than even the top-of-the-line Model S P100D, which performs the benchmark zero-to-60 sprint in about 2.4 seconds when Ludicrous mode is engaged.

"There is, of course, one speed faster than Ludicrous, but that is reserved for the next-generation Roadster: maximum plaid," he wrote at the time. The names of the performance modes are borrowed from the movie Space Balls.

It's too early to tell what Tesla's next convertible will be powered by. While the original model (pictured) was loosely based on the Lotus Elise, its replacement will be entirely developed in-house.

Replacing the Roadster isn't one of Tesla's main priorities. Again posting on Twitter, Musk warned a new convertible is "some years away" from breaking cover.