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  1. #1
    Senior Member Winfried's Avatar
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    Electrifying a Brompton: Tough? Expensive?

    Hello

    I just saw someone riding a Brompton with home-made conversion kit. He was so fast I could barely follow him on my hybrid :-)

    At the red light, he just told me he built it himself, that it took a bit of electronics, and off he was.

    The black battery, which looked like my scooter's lead battery, was sitting in the front where the Brompton bag goes, and it looks like the electric motor was in the front wheel.

    Google tells me that commercial conversion kits cost several hundred $/'s, so I wanted to ask geeks here:
    1. How much would the parts cost to build a home-made solution?
    2. What technical skills do you need to do this yourself?

    Thank you.

  2. #2
    Senior Member bargainguy's Avatar
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    I'll answer in a different way. The Nano and the FreedomBike conversions seem to be the two biggies, so see if their descriptions work for you.

    http://www.nanoelectricbikes.co.uk/

    http://www.freedomebikes.com/Kit-for...hon--Tern.html

  3. #3
    cpg
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    Senior Member cpg's Avatar
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    Have a good look at the Pedelecs forum, there is plenty of info on there. Here is one to get you started, I think it was stated by someone who is also a member of this forum.

    http://www.pedelecs.co.uk/forum/elec...onversion.html

    There are other Brompton threads on there as well as discussions about other folding bike conversions. I have been following one about a Mezzo conversion.
    Mezzo I4 (converted to dual drive), Whyte PRST-1, Trek 1200, Dahon Jack, Bickerton (work in progress)

  4. #4
    Senior Member Winfried's Avatar
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    Thanks, I'll check it out.

  5. #5
    Senior Member kamtsa's Avatar
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    Quote Originally Posted by Winfried View Post
    Thanks, I'll check it out.
    Brompton also has its electric upgrade project

    http://www.wired.com/gadgetlab/2011/...the-ebrompton/

    Considering their difficulties of bringing products to production (bPod, magnetic water bottle, titanium seat post, etc) I would not hold my breathe.
    Happier than a camel on wednesday.

  6. #6
    Senior Member Winfried's Avatar
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    I wish I had the tech skills to build my own

  7. #7
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    I have been converting and upgrading ebromptons for over 3 years now. Here is my latest super light M2L-X with a very low assist lightweight (not the Tongxin/Nano motors mentioned which I have already tried) and has the same carry weight 11.5kg as a stock M3L. This motor is about 1.4kg and is not much bigger (about 98mm across) than a dynamo. I have now done over 5000 miles in three years on my daily commute Brompton econversions.



    This is the flickr set http://www.flickr.com/photos/4505157...7630015987898/

    As stated there are loads of pedelec posts covering this, some of them mine, plus on the yahoo Brompton forum this was covered extensively very recently.

    Note the stock Brompton e conversion has been put on hold with no firm date of when they will go to market. I had extensive discussions with them with mine above and it is clear they will not come to market until they are 100% sure it will work reliably.

    As stated it does require a certain amount of skill to undertake conversions depending on if you get someone to do the whole conversion, buy a kit or as I do now source all the parts individually direct from China and build your own wheels. The latter is by far the cheapest option and costs me about 250-300 including a small battery. Getting someone to do it for you can cost almost as much as the original bike in some cases!

    Here are the two motors I have tried.





    Jerry
    Last edited by jerrysimon; 06-23-13 at 04:00 PM.
    Brompton M2L (SRAM A2), Brompton M2L(X), Dahon Uno (SRAM A2), Both Swift Xootr & Moulton TSR2 now gone

  8. #8
    Senior Member Winfried's Avatar
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    Look really cool :-) Thanks for the infos.

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