I've got to give this guy full marks for ingenuity.
The halbrad [shown below] looks like a regular bike that’s missing its front half. It’s about one meter [39 inches] high and 79 cm [31 inches] long.
Its handlebars are located underneath the saddle, so to steer, riders must sit up straight and hold their hands below their thighs - allowing them to turn the tiny front wheel attached to a rod that descends from the saddle.
Felix Kruschardt, creator of the halbrad, came up with the idea based on his past work as an orthopaedic technician.
“The rods of wheelchairs fitted perfectly to the ones you get on bikes. I just welded them together,” he explained to The Local.
“Me and my friends managed to ride this first home-made halbrad.”
The Berlin-based inventor says that users can comfortably ride at up to 28km/h - or at a walking pace alongside friends on foot.
Kruschardt adds that the bike’s low weight and small size make it one of the lightest bikes on the market at just 9 kilos [20 pounds].
There's more at the link.
Here's a video of the inventor displaying his new toy.
I suppose that, in overcrowded German cities, this compact space-saving bike would actually make a lot of sense. I'm not so sure about its practicality if you want to take home a bag of shopping, though . . .