minime -
1. I found Fast Electric Bike's '32 mph How to Build, Where to Buy Complete Guide' youtube video very informative. As did 168,274 others apparently. He's in London.
He covers buying the needed parts and assembly.
a) 1000 W direct drive motor already mounted in a rim, with a controller and display, for around £200, from ebay UK and
b) a 48V 20Ahr Li battery from Aliexpress China also around £200. Don't necessarily agree that Aliexpress is the way to go on the battery. Em3ev - an Englishman in Hong Kong (with production in Shenzen?) is also recommended as standing over his products. But the UK would be nice for warranty work on a battery...
He also has videos on the recent availability of 1500W and 2000W kit versions for 40 mph and 50 mph ultimate speeds. Way too fast for my blood (near geriatric and hoping to stay that way for a _long_ time). Presume you can work out for yourself that if you get it wrong - assembly, riding, or collision with a 'cager' - at 40 mph, or 50 mph, on a bicycle it's Game Over. As in Brown Bread. Dead.
Fast Electric Bike '32 mph How to Build, Where to Buy Complete Guide' - youtube -
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2. It was d8veh who among many other useful things pointed out that the high cost of retail ebikes is due to a) hand-holding of the customer b) warranty work and c) marketing, all of which are costly and that you may be able to reduce the cost by doing it yourself, relying on inexpensive components sourced from China, to do your own maintenance and warranty. Plus you'll better understand the ebike you've assembled. In many cases it's quite simple to add a well designed ebike kit to an existing bike, as Fast Electric Bike, d8veh and many others have shown.
All d8veh's builds -
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http://tinyurl.com/gortc92
OR see his sig, via search.
3. Then there's the redoubtable cwah who also travels round London fairly swiftly, apparently on a Dahon Jetstream but presently, who knows - he's not taking any credit. ; ) -
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'This Morning's Sunday Times' -
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http://www.pedelecs.co.uk/forum/threads/this-mornings-sunday-times.25377/
4. I appreciate d8veh's decision that 20 mph is an adequate average speed for an ebike. On grounds of health and safety, age, caution, or whatever. A lighter motor needs a lighter battery for a more bicycle-like experience.
Justin Lemire-Elmore - of ebikes.ca and Endless Sphere - worked out that at 25 mph an ebike could handily revolutionise urban travel, by comprehensively outpacing cars for urban journeys. And in London probably by several times!
5. In answering your question I presumed that you and others on this forum are adults, make your own decisions and that it is certainly not my place to tediously correct you on matters irrelevant to your question. But not every poster shares that opinion apparently. No change there, then!
Happily not something I have to worry about as I live in another jurisdiction. Or none, this being the aether. Good luck. And mind how you go! ; )
6. NB. I note that '1500W' at point 2 above has acquired a hot-link to 'pedelecs.co.uk/electric-bike-guides/uk-electric-bike-law/'.
I was not aware that my posts could be edited by others at will, without the courtesy of discussion, notification, or any indication whatsoever.
I certainly will not be continuing to post on a site where I have to continuously monitor my every historical post to see if / how my words have been altered, deleted, 'improved' or otherwise changed by some unaccountable 'other'. For any reason whatsoever.