BMW has offered several folding bikes over the years, none of which to my knowledge was actually
designed by them (same for Mercedes by the way). In addition to the Q6.S, there was the Q5.T (photo
below). In 1996 BMW OEM'd folding bikes from Montague. One model was the "Official Mountain Bike" of
the 1996 Olympic games in Atlanta. It was given out to VIPs and Olympic officials. They also also had a
BMW folding tandem (brochure scan below), which I think was made by Montague as well but I'm not
entirely certain.