NEW YORK — In its 73-year history, the Beetle has evolved from the hippie ride of choice to a cute chick car. Now Volkswagen is reinventing it again.

The company introduced an edgy design Monday for its signature model, giving it a flatter roof, a less bulbous shape, narrowed windows and a sharp crease along the side. Gone is the built-in flower vase on the dashboard.

It’s the first overhaul since 1998, when Volkswagen came up with the New Beetle. VW, which wants to triple its U.S. sales of cars and trucks over the next decade, says the changes will appeal to more buyers, especially men.

But the changes could also anger fans, who love the little four-seater for its huggable curves and perky attitude.

“I hope they keep the fun in the car, and all the round angles,” says Howie Lipton, who owns a computer repair business in Hamilton, Ontario, and helps organize an annual New Beetle show in Roswell, N.M.

“I hope they keep the fun in the car, and all the round angles,” says Howie Lipton, who owns a computer repair business in Hamilton, Ontario, and helps organize an annual New Beetle show in Roswell, N.M.

Lipton says he was hoping VW would update the spare interior, and his wish has been granted. VW’s lead Beetle project manager for the U.S., Andres Valbuena, says the 2012 model will have a navigation system, a significantly larger trunk, more luxurious materials and ambient lighting. “It ties in more with our other products. It’s more upscale,” Valbuena says. The 2012 Beetle goes on sale this fall. VW won’t yet say how much it costs.

The design is based not on the New Beetle but on the original Beetle, which was created in Nazi Germany in the 1930s, came to the U.S. after World War II and became a counterculture favorite because of its low cost and unusual look.

It was the antithesis of the land yachts being churned out in Detroit, and Baby Boomers loved it. In 1968, a Beetle with a mind of its own, Herbie, starred opposite Dean Jones in the hit Disney movie “The Love Bug.”

But sales slowed as VW faced tough competition in the small-car segment from Japanese and U.S. automakers and money problems back in Germany. U.S. sales of the original Beetle peaked at 200,000 in 1962. VW stopped selling the car in the U.S. in 1979.

In 1998, the company introduced the New Beetle, an overhaul of the original that became a huge hit. Buyers swooned over its cute, rounded styling and the vase next to the steering wheel that held a Volkswagen-issued plush flower. That was a nod to the original Beetle, which offered an optional vase. For a time, the Beetle was outselling such stalwarts as the Ford Focus and Chevrolet Impala. When a convertible version was released in 2003, U.S. sales rose to almost 93,000.

Larry Erickson, who led a lauded redesign of the Ford Mustang six years ago along with New Beetle designer J Mays, says people are unusually attached to the original Beetle and New Beetle because of their friendly shapes and the confident but unaggressive way they sit on the road.

It will be difficult for VW designers to capture that emotion and still make the car look current, he says, especially because it hasn’t been that long since the 1998 redesign.

“Every car manufacturer faces this when they do a facelift, but in the case of the Beetle, you’ve got something people feel fairly strongly about,” says Erickson, who now teaches at the College for Creative Studies in Detroit. “It has a certain personality to it, an endearing quality.”

Valbuena says VW believes the new design stays true to the name but will broaden the car’s appeal beyond the 1998 version, which appealed heavily to women in their 50s and 60s. In focus groups, men liked the more aggressive design.

The vase won’t even be an option this time, Valbuena says, dumped in favor of more universally appealing options such as color-coordinated dashboards and an extra glove box.

In addition to an upgraded, 170-horsepower, 2.5-liter gas engine, VW will offer a sportier, 200-horsepower, turbocharged gas engine — Volkswagen hopes it will appeal to guys — and a fuel-efficient diesel. VW estimates that the new basic engine will be slightly more efficient than the current one, which gets 29 mpg on the highway. The diesel will get up to 40 mpg. Asked whether VW will offer an electric version, spokesman Corey Proffitt says, “Not yet.” Even if it satisfies its fans, the third incarnation of the Beetle will have to compete in a U.S. small-car market that is bigger and much more competitive than it was in 1998.

When the New Beetle was introduced, European cars like the Mini Cooper, Smart Fortwo and Fiat 500 weren’t sold in the United States. By last year, the Mini Cooper was outselling the Beetle almost three-to-one.

And buyers who want a funky design have new options like the Kia Soul, Nissan Cube and the Scion xB. VW sold about 16,500 New Beetles in the United States last year, down 82 percent from the 2003 peak.

Working to Volkswagen’s advantage are higher gas prices and fuel-economy standards, which make small cars a smarter choice, along with a population boom of young buyers. Their parents, the Baby Boomers who fell in love with the Beetle 50 years ago, are also looking to trade down in size.

Rebecca Lindland, director of strategic review at the consulting firm IHS Automotive, says U.S. sales of small specialty cars like the Beetle dropped during the recession as buyers went for bigger, cheaper options like the Toyota Corolla. The Corolla costs almost $3,000 less than the Beetle, which starts at $18,690.

But Lindland says U.S. specialty car sales are expected to more than double to 350,000 cars per year by 2013.

VW will depend on high-volume sellers like the Jetta and Passat sedans to meet its ambitious sales goals, which call for selling 1 million vehicles in the U.S. and 10 million worldwide by 2018.

But it still sees the Beetle as a key part of the brand, as it showed Monday with simultaneous unveilings of the car in New York, Berlin and Shanghai. To many people, VW is synonymous with the Beetle.