According to Ing leaked footage from The Avengers's sequel finds Johansson's stunt double "doing work" on Project LiveWire.
Harley-Davidson unveiled the upcoming Project LiveWire on June 19, writing in a press release that "preserving the riding environment is important to all of us."
"Project LiveWire is just one element in our efforts to preserve and renew the freedom to ride for generations to come," said Matt Levatich, President and Chief Operating Officer, Harley-Davidson Motor Company. "As a company that has seen success for 111 years, we think in generational terms about our great riding environments for the next 111 years."
Johansson, 29, will reprise her role as Natasha Romanova in the upcoming film. Robert Downey Jr., Chris Hemsworth, Chris Evans, Jeremy Renner, Samuel L. Jackson and Mark Ruffalo will also return for the film.
Age of Ultron will be released on May 1, 2015.