As you might be able to guess from the name, Flexit sidecars were designed to lean with the motorcycle, yielding much better handling characteristics than a traditional sidecar rig. Approximately 167 were built between 1981 and 2005, making this a rare and interesting take on 3-wheeling.
Factory brochure cover, photo from http://www.improvelife.info/links/bikes/flexit.htm#5
The Flexit can be hooked up on either the left or right side and is capable of leaning 35 degrees in either direction. You’ll also get a disc brake, air shocks with onboard compressor, and an electric sliding canopy – not bad! For more information on (and a whole lot more photos of) this interesting rig, check out this site. Apparently, it also comes with the taillight from a Honda Accord.
The K100RS is said to be in very good condition with stainless steel brake lines, fresh filters, new wheel bearings, and ~22,000 miles on the odometer. The sidecar “has been freshly painted and upgraded with Brembo brakes, LED lights and USB power ports.”
Find this BMW with sidecar for sale in Richmond, Virginia for $11,999 here on ADVRider (registration required).