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they charge you extra EUR 160 to deliver it to the UK. The extra charge gives a fair comparision with bikes bought on internet in the UK. The saving due to exchange rate could be as much as 15% to 20%. The sDURO is a smashing bike for EUR 2k. I can't see any high end Chinese bike compete with...

they use a DD motor (read heavy) on the copenhagen wheel. If you use the same geared motor as the Woosh TS (3kgs) with 20 3,400mAH cells (1kgs, 36V 7AH) and controller (300grs), the rear wheel would weigh about 4.8kgs including rim and freewheel, and the range is about 20-25 miles. The cost of...

www.radhaus.de They are quite happy sending your bike directly to the UK. I was looking at the Haibike sDURO Hardseven SL, including courier to UK, EUR 2,159 or about £1,567 against Martin's price of £1,849.

I was watching it on Click this morning - it seems that they are more interested in the app than practical stuff like range and torque. If the principal interest behind it is to make a light and cheap assist kit, we have almost all the required elements already mass-produced: 250W geared motor...

it's doable at $350 in China, £399 in the UK with a 36V 5AH battery with a wireless torque sensor.

I've got the $50 price from another manufacturer in Shenzen last year. I also like the look of this one, but have not tried it yet: I know the Woosh TS bike quite well, this bike uses a motor with the torque sensor inside the motor. http://wooshbikes.co.uk/?sport-ts xmax make the motor AKA...

you are very much on tthe right track. Lots of us would be very interested to read about a self build project for a super efficient e-bike for cyclist. The torque sensor simply measures how hard you push on the pedal, typically from 0-25NM on most systems. Xiongda system is a straightforward 15A...

the 500W BBS02 is truly awesome on hills.

here you go: http://www.ebay.co.uk/itm/Kudos-Versatile-Folding-Electric-Bike-Ebike-LiFePo4-Shimano-Nexus-Kenda-Tyres-/331488482583

You probably won't get much from selling the e.bits second hand. I'd send the battery back to them and ask for a full refund on the £360 bill.

I blip the brake leavers before changing gear but if that bothers you, either a torque sensor or a gear sensor like this one will sort that out: http://gearsensor.com/

three things that make me prefer a crank drive: first thing is speed when you ride derestricted. If you have the bigger power, 350W or 500W, you can go as fast as you can pedal, the motor keeps giving, no limitation there, you may run the 250W to its limit, I sincerely doubt you'd run the 350W...

I'd go for a straightforward 12V mechanical relay and normal lock switch. SSRs are dodgy if you don't fit a big heatsink.

for the kind of power you have in mind (up to 11kw), I reckon you'd need a relay that can handle 100A without melting, something like this one: http://www.aliexpress.com/item/1pcs-DC-12V-500A-AMP-High-Current-Relay-Contactor-Power-Motor-Control-On-Off-E4027/1734108571.htm or a solid state...

That law is ancient. It was enforced since early 70s.

Nah... not the DD Sparta ion motor, no match for a Bosch bike. It says 'up to 50NM' on their website. Show us a motor performance chart. What sort of efficiency at 50NM?

I think efficiency v RPM is more or less fixed. For a 250RPM motor like the xiongda XD, best efficiency (82%) is around 205-210 RPM, around the typical 80% of max RPM. If you run the motor at half that, 105 RPM, efficiency would drop down to around 50%, more or less at any current, the operating...

the voltage that you measure varies a lot with the Amps being drawn. It is not a reliable method to relate the voltage you see to the remaining charge of your battery. For a more reliable method, you need to use calibration - another word for guessing what would happen in between two known sets...

I've been looking for cases where the use of the throttle in Europe would attract a fine. It could well be that a generally type approved thumb throttle could be later fitted to all brands of bikes.

this document sums up pretty well the points I tried to make. www.parliament.uk/briefing-papers/sn02239.pdf what is fair is for the Court to decide on a case by case basis. SGA does not give the consumer 6 years guarantee, only the right to redress for hidden faults that could not be seen on...