Hi All, We as the name of the thread suggests, I will be starting work on the next electric bike. This thread can also be a place to discuss the merits or otherwise of my decisions on how it will be built. I have learned a lot from the construction of Voltron; perhaps the objective now is to plan the kind of bike I want right from the start rather than change plans mid-way and end up with a bike that disappoints on all levels. My starting point is the chassis. A modern, race replica chassis will be a good place to start. I will be looking for a litre sports bike as a foundation for the build, but who knows, maybe a 600 frame will suit? Steel or alloy, doesn't matter as long as the weight is as low as practical. Carbon fibre rims are another way of keeping the weight down too. I will be sticking with A123s 20 Ah prismatic cells. A stack of 113 cells in series will give me about 415 volts fully charged, and 373 V nominal. Total capacity is therefore ~7.5 kWh depending on whether it is fully charged or not. I will need to check for any rule changes, but at least if it's all in series, it's easy to take a few cells out from the top. I planned on using the EMRAX motors, as they are the same size and weight as Agnis, but are brushless and put out more power. It is a liquid cooled motor and controller, so the bike needs provision for this. However being an outrunner it's not a convenient motor to grapple with. Dual motors means dual controllers. Sevcon and Piktronik make high voltage AC motor controllers, but they are rather bulky. EMRAX tells me they are currently testing several controllers, and are even working on their own, so I might end up being a beta tester for them. I especially like this feature: http://www.enstroj.si/images/stories/emrax_motors_zzz.jpg As always, I am always up for advice and tips from the MCNews community. If you think my idea is dumb, I can count on you to tell me so. I promise I won't get upset And as Dunger King once said, "and fer chrissakes, do not tell me something cannot be done unless you can show me the carnage caused by trying!"