The B10 had been the manufacturer's (and Europe's) first production car comprising an all-steel body. Its replacement -- the B12 -- was the second. This approach garnered much positive reaction in an age that valued innovation, but the B10 itself had forced the manufacturer onto a very steep learning curve, which unfortunately had been shared by customers. The B10 had been insufficiently rigid. Once the car got moving, the body had twisted and flexed, causing sections of bodywork to become detached and doors to open spontaneously. The B10 had inherited its chassis from the B2, but it was quickly apparent that a stronger and stiffer chassis would be needed to complement the necessary rigidity of an all-steel car body.
