The redesigned Smart ForTwo and ForFour minicars will share up to 70 percent of their components with the redesigned Renault Twingo subcompact unveiled at the auto show here, but they will bear no resemblance to the new Twingo.

The Smart models will be even shorter than the Twingo, and will have the traditional Smart B-pillar, said Annette Winkler, head of Smart worldwide.

Daimler and Renault jointly developed the three cars, which use the same platform and Renault internal combustion engines. Smart alone will offer a battery-electric version, but it won’t be available at launch, Winkler said.

Smart will unveil both of its tiny cars sometime before the Paris auto show in October. They’ll go on sale in Europe this year.

Only the ForTwo will be sold in the United States, starting in August 2015. Smart has decided ForFour sales won’t be high enough to warrant the cost of homologation, Winkler said.

The four-seat Twingo is 3581mm (141 inches) long, 1549mm (61 inches) tall and 1651mm (65 inches) wide. The Smart ForTwo will retain its current length of 2692mm (106 inches). The ForFour will be 3505mm (138 inches) long, Winkler said.

The Twingo is available with a 1.0-liter three-cylinder gasoline engine that makes 70 hp and a 900cc turbocharged three-cylinder rated at 90 hp. Smart will use both engines.

Renault will not make a two-seat version of the Twingo. Only Smart will have that with the ForTwo.