Last month a video of the DERBI GPR EV showed up on YouTube. It was posted by someone who appeared to be working with Sevcon and it was hard to tell if DERBI was behind the bike. I recently found the blog of Derbi Project Manager Carles Carrera. And guess what, he has a detailed picture of the Derbi GPR EV front and center.
Carles describes the ground up development methodology DERBI and their partners used in designing and building the bike over the course of 3 months. He cites flaws in Brammo, Zero, Quantya, Vectrix mentioning thier “poorly developed mechanical platform” and saying they fail to deliver an electric motorcycle that has all drive components communicating in an orderly fashion.
Christian Amendt, an engineering student out of Germany is the first confirmed entrant of the FIM ePower Electric Motorcycle Race series. Using what might be called a quantified version of Lotus’s “performance through low weight” philosophy, Christian converted a Honda RS125R to electric using a “half the weight, half the power” design.
The 115kg (253.5lbs) electric race bike weighs 187 lbs less than the triple motor MotoCzysz e1pc. The theory is that the light weight will allow the 96 Volt, single motor, 3 kWh Epo-bike to out perform a 2 or 3 motor bike that weighs over 400 lbs with the batteries needed to power them. The Epo-Bike uses a Lemco D135 DC motor, LiFePO4 batteries from an undisclosed manufacturer and an Alltrax AX7425 controller to achieve 74Nm of torque and reach a top speed of about 111 mph. See more pictures and a video of the epo-bike on the track after the break.