1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

DIY Electric Bicycle, Entry #11: Building the Bike

Blog entry posted in 'Uncategorised', Aug 29, 2011.


5) After rigging up the support bar, I set the actual rack on it to see how it looked:
bike progress 009.jpg bike progress 010.jpg
6) And after a bit of welding...
bike progress 011.jpg bike progress 012.jpg bike progress 013.jpg
7) Now for the vertical supports. I decided to do what most professional bicycle racks do, and support mine on the rear axle of the bike. I took some strips of metal and drilled a couple of holes in them to slide over the axle:
bike progress 014.jpg bike progress 015.jpg
8) And connected....
bike progress 016.jpg

To be continued (still)...
  1. Resistanceisbutyl
    Resistanceisbutyl and four others like this

    I'm thinking the support strap will help keep the belt or chain running from the motor nice and tight, too.
    Resistanceisbutyl, Aug 29, 2011
  2. tiwary chandan
    please clearly discribe about diy electric bicycle
    tiwary chandan, Aug 29, 2011
  3. ElectroMaster
    Lots of progress! I'm looking forward to seeing the motor fastened :)
    ElectroMaster, Aug 29, 2011
  4. DerStrom8
    Thanks all for the replies! =)

    Resistanceisbutyl: That's the hope, anyway. The vertical supports will keep the rack from sagging, preventing it from touching the top of the rear wheel, and also will keep the chain taut.

    tiwary chandan: That's pretty much what I'm doing, isn't it? ;)

    ElectroMaster: Thanks, that post is coming up next! :)
    DerStrom8, Aug 30, 2011
  5. strantor
    I read about your bike, now I see it. what motor/starter/alternator/generator did you end up choosing?
    strantor, Sep 3, 2011
  6. strantor
    never mind I saw the earlier blog entry. VW starter,
    strantor, Sep 3, 2011
  7. DerStrom8
    Haha, yep--that's right. If it turns out it doesn't work, I'll just find a bigger starter motor or a generator. I found lots of videos of bicycles on youtube that use starters, so they should work.
    DerStrom8, Sep 3, 2011
  8. cr0sh
    A couple of suggestions (I've got a similar project in "back-burner" mode):

    1. Once you get everything situated and built, look into AmeriTyre (http://amerityre.com/) bicycle tires - they aren't you're typical "solid" flat-free tires; I have a pair on my regular bicycle, and they act and feel -exactly- like an inflated standard tire. IMO, they are well worth the cost. One caveat (not likely an issue with an electric-bike, but I thought I would mention it): You can't do "stunts" with AmeriTyre tires; they don't "deform" like a regular inflated tire and innertube, and will jump off the rim with such extremes (I found this out the hard way - LOL).

    2. If the starter motor doesn't work out for you, or you want to try something different - look into the idea/concept of off-the-shelf large-scale R/C brushless DC motors, as well as converting an alternator into a brushless DC motor. If you want to see something wild (and leaves me green with envy - this was what I was trying to do, but I don't have the machining skills this guy has):


    That's with a fairly small R/C brushless motor, a custom machined belt-drive "gearbox", and a custom-made LiPo (IIRC) battery pack - the power-to-weight ratio of his system is amazing, IMHO (though I doubt it was inexpensive)...

    Good luck with your bike - I'll be following your progress! :)
    cr0sh, Sep 25, 2011
  9. DerStrom8
    Wow, that's quite an impressive build! Thanks for posting!

    I'm always on the lookout for ways to improve my bike, but at the moment my goal is just to get it put together :D
    After that, I'll consider getting better parts. I will definitely look into your suggestions, thanks! :)
    DerStrom8, Sep 25, 2011
  10. strantor
    hey, what type of controller are you going to use? are you making your own?>
    strantor, Sep 26, 2011
  11. DerStrom8
    I've settled on a simple temporary push-button switch to control a large relay. I think PWM would just be a waste of power.
    DerStrom8, Sep 27, 2011
  12. koolguy

    are you any motor to drive it??
    if yes,pls tell name of it....
    koolguy, Oct 1, 2011
  13. DerStrom8
    Have you read the beginning of the blog yet? This is the 11th entry, so there are 10 more before this one. I suggest you read those entries, too--I go over all the basic parts, including the motor I plan to use.
    DerStrom8, Oct 1, 2011
  14. carbonzit
    Hey, the title up there says "Building a homemade 4" diameter spark gap Tesla coil", but then there's all this stuff about an electric bike.

    I want my money back! I wanted to see gigantic sparks!
    carbonzit, Oct 7, 2011
  15. Resistanceisbutyl

    put a fistful of straight pins in your microwave... you'll see all the sparks you'd ever want lol
    Resistanceisbutyl, Oct 8, 2011