Jamie

Hi Tangsoo, Yes a fair bit of fabrication involved at this stage, this is due to it being a prototype. The top tube and down tube sections also have a box section running through inside that is out of view here, adding integrity. That design is from 2mm aluminium sheet, and after some initial finite element analysis shows to be surprisingly strong and light. The frame shape is designed to be something between a step through and male frame, the image is a bit deceiving as the top of the seat post is only represented with a centre line. It it supposed to represent a type of uni sex frame geometry for a 95th percentile European adult. The target market is UK city commuters. After many surveys, interviews, questionnaires etc I concluded UK users do not so much like the 'European' step through/racks/baskets galore style electric bicycles and prefer subtlety. Hence the design is to have some kind of hidden integrated battery that is also removable for practical recharging. A frame shape that is not too 'hardcore' so to speak but looks close to a regular bicycle. The design is changing all the time with finite element analysis checking and material testing in the lab. I have some basic renders I will upload shortly..

So far..

Thanks for the advice guys..certainly given me a lot to research.

Thanks guys

Yes it was super smooth and must have taken quite some development to get it like that. I would really like to get mine as smooth as possible so the speed control system just won't cut it. I am thinking of using Arduino and a torque sensor bb to give a throttle signal..

Hi all, Does anyone know of any UK parts suppliers? More specifically for a 250w geared hub motor/700C rear wheel LiPo batteries Controller for the above that can work with a torque sensor bb Associated wiring etc Any pointers will be hugely appreciated! Many thanks, Jamie

Hi d8veh, I tried a Mercedes Smart eBike a while ago which i believe uses a torque sensor also. It was very intuitive to ride and took less than a minute to get used to. I really liked there was not a hand throttle and you kind of became mechanically part of the bike to control the power output. At the moment with regard to the controller I'm not totally sure..initially i wanted to build my own however in the interest of time I may have to buy one. Thanks for that advice about the drive systems you mentioned.

Evening all, I'm from London and am working on an ebike project I would like to share with this great place.. It's a custom lightweight framed city commuter aimed at UK/European cities. I believe I have settled on using a 250W geared hub motor for rear drive. The wheel size I am working with is 700C with a 28mm tyre. I am intending to use single speed belt drive and disc brakes front and rear. The aim of this concept is of city commuter use, fairly flat-tarmac terrain and a range of around 25 miles or so. (the more the better) I would like to have a PAS system and no hand throttle whereby the more you pedal you more power ids delivered. I am working on a custom aluminium frame to be a light as possible while being strong enough. The idea is to make the bicycle as subtle as possible and the battery pack to be integrated in to the frame and removable for recharging also. The controller is to be integrated in to he frame. I will hopefully be ordering parts over the next week or so and will document everything on here.. the frame design is almost settled pending stress analysis results. If anyone has any input, advice or would like to ask anything please be my guest, Best, Jamie