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I mean by power consumption WH/mile. I don't understand what you are trying to say, but this article explains the motor constants Kv and Km. Enginneers use them to work out how the motor would behave in a bike. https://en.wikipedia.org/wiki/Motor_constants Remember a motor needs a controller...

At 42V, the 48V 500W motor draws less Amps than 36V 500W motor. The difference depends on the motor design but generally, you lose about 25% power when you run 48V motor on 36V battery. The power consumption depends mainly on the speed you ride. As you cannot reach the same speed with a lower...

that tricycle is quite straightforward to convert with a legal BBS01 250W and a 15AH downtube battery. Don't go for high power, the trike is not stable in corners, so you need to limit speed to about 10mph. If you take your trike to Woosh in Southend, they'll do it for you in a couple of hours...

your battery is probably standard 36V Lithium. Flat, 33V, fully charged: 42V. The standard Lithium charger has output voltage 42V maxium 2A without fan, 2.5A to 4A with fan. Stick with your 42V/2A charger.

+1. I don't have throttle on my bike and I rarely go over 15mph.

a mile a week if you can. Give it a top up charge after 2-3 months, once before Christmas then at the end of Feb. Keep the bike dry.

woosh Zephyr-B. http://wooshbikes.co.uk/?zephyr-b It has BPM motor and hydraulic brakes. Shambolic is selling his for £600. http://www.pedelecs.co.uk/forum/threads/5-month-old-woosh-zephyr-b-%C2%A3600.22172/

you don't have to spend £1000 for a fast bike. start with a strong motor, BBS02 48V.

check the motor cable. It should be a 3-pin, the motor is hall-less. You can replace it with any Hall-less hub motor. Cost: about £100.

@rolhoffboy. You'll upset half of the forum for saying that crank drive motor is 21st century and the other half for mispelling the word derailleur.

if you cannot overcome the magnets with both hands, last resort: use something like this:

Your post seems like a good advert for the R&M Delite Rolhoff Mountain biike. AMPS may have it at the show. about £5,000 each. http://en.r-m.de/bike/delite-rohloff-mountain/

we have exhausted all the easy checks. You'll need to have access to replacement controller and motor. Where about do you live?

I am a dinosaur and in my younger years, happened to adore Marc Bolan.

That second video is concerning. if the cassette was tight before and now it's not, the thread on the cassette adapter may have gone. Use the lockring tool to undo the lockring and remove the cassette to check the state of the thread.

For your height, if you weigh under 14st, Woosh Petite: http://wooshbikes.co.uk/?petite Over 114st, Woosh Big Bear LS: http://wooshbikes.co.uk/?bigbear-ls Woosh ship VAT free to the Channel Islands.

@shambolic - how about emailing a couple of pictures of your bikes to Andy @ woosh and ask him to advertise your bike on their second hand page? the bikes on there sell usually in a couple of weeks.

speed reading drops to zero: there are two possible reasons. 1) your bike does not have an external speed sensor, the controller counts the motor pulses and the motor has stopped, we still don't know what causes the motor to stop.. 2) your bike has an external speed sensor (you see a magnet...

that depends on the make of your cassette.

it seems that your lockring is undone. If this is not the case, then look for a missing spacer. The cassette adapter on the motor side is made for a 9-speed, you have 8-speed, you need a spacer.