The Freicycle is much more costly than that, nevertheless it’s additionally lighter nonetheless. It’s additionally only a prototype and there are not any present plans to deliver it into manufacturing.
The Freicycle was designed by mechanical engineer Dennis Freiburg from Germany, and was verified by the Guinness Guide of World Information because the lightest e-bike on this planet in December 2019, in Dortmund, Germany. It weighs as little as 15.5 kilos (6.872 kg) and, although you may’t inform by it, it’s motorized.
“Largely, the individuals can not imagine that it’s an e-bike,” he mentioned on the time. “They hold lifting it up and saying loopy how mild it’s.”
Although Dr. Freiburg set the file some time again, it’s simply now that he’s disclosing the recipe to his successful design. The key, he tells New Atlas, was to take the lightest body on the market (carbon fiber, in fact) and add to it solely the naked requirements, both from carbon fiber or 3D printed. The purpose was, from the beginning, to get into Guinness – however the venture additionally served as a part of a venture for his doctoral diploma. Discuss killing two birds with one
Ranging from a 2016 Merida Scultura bike, which has a carbon fiber body that weighs 2.2 kilos (1 kg), Dr. Freiburg added rim-mounted brakes, carbon rims, full carbon crank and 3D printed pedals. He went by means of a number of combos and options till he acquired the bottom weight doable.
For energy, Dr. Freiburg additionally wished one thing that might add as little as doable to the full weight. There are some hub or mid-mounted motors on the market which are mild, however not as mild as he wanted them. So he turned his consideration for one thing that’s been round for years: friction drive, the place a powered curler is pressed in opposition to the rear tire, making it spin.
Dr. Freiburg took the brushless motor from a mannequin helicopter delivering 660W of energy and used it on the Freicycle. When the motor is on, the swing arm on which it’s mounted drops the curler onto the tire and its abrasive sleeve has sufficient grip to show the wheel. When the motor is off, the spring-loaded mechanism pulls the curler off the wheel.
As a result of Dr. Freiburg lives in Germany, the bike has been electronically restricted to 250W and 25 kph (15.5 mph), however he says it may well attain prime speeds of 48 kph (30 mph) with out the restrictions. In contrast to with normal e-bikes, the burden on this one makes it as straightforward to experience in non-assisted mode because it’s in motorized mode.
One other problem with the bike was the battery, as a result of Guinness calls for a 137-Wh battery as a way to set up any file within the e-bike class. So Dr. Freiburg constructed a battery inside a water bottle, which is he then positioned in a 3D-printed cage on the seatpost. The battery, he says, is nice for 19-35 km (12-22 miles), however the rider can at all times carry a secondary “water bottle” for further vary. The lid on the bottle turns the battery on and off, and will also be used to set the pedal help ranges.
Since this was a motorcycle constructed for science (and Guinness) and since Dr. Freiburg had loads of backup from companions just like the TU Dortmund College, Karlsruhe Institute of Know-how, Velotech and Merida Bikes, cash was not a difficulty.
The whole price of the Freicycle shot as much as €20,000 ($23,866 at right this moment’s alternate charge) which, sure, is a ton of cash. And it additionally hints that this will likely by no means transcend this venture stage.