Electric bike A German engineer took on the challenge of creating the world’s lightest electric-assist bicycle. He succeeded at the cost of hunting for superfluous grams and a simple but very clever idea to start it motor / battery.
The electric bike you have under the eyes is considered the VAE lightest in the world (prototype class) according to the Guinness World Records . Called Freicycle , it weighs just 6.8 kg and is a unique model developed by Dennis Freiburg, a German engineer who set out to beat this record. For this, he started on the basis of a Merida Scultura road bike whose frame weighs only a small kilo. He obviously made extensive use of carbon (fork, wheels, crankset, handlebars, seatpost …) as well as 3D printing, especially for the pedals.
For propulsion, the engineer used a 600 W friction motor from a model helicopter . Covered with an abrasive coating, it is directly in contact with the rear wheel that it drives. To comply with European legislation on electric bicycles, the motor is limited to 250 W with assistance that cuts off at 25 km / h. In theory, it could reach almost double (48 km / h).
The battery hidden in the can
For the battery, Dennis Freiburg transformed a hydration canister into a 137 Wh accumulator whose 3D printed cap acts as an on / off switch for the system. The motor / battery unit weighs less than 2 kg and the range is between 19 and 38 km.
Now comes the angry question: the price. The overall budget to create the Freicycle amounts to 20,000 euros. It’s obviously huge for a bike, even an electric one, but it’s the price of a record and a unique piece. And it is very likely that wealthy enthusiasts will be ready to pull out their checkbook if Dennis Freiburg ever agrees to produce replicas of this incredible featherweight electric bicycle .