OPEN SOURCE DESIGN PROJECT

Before you can design anything, you need to know your own personal center of gravity. This data will follow you wherever you go in the design process.

side view with figures 2d
Pick a bike that feels comfortable to you and perform the following test. If you weigh 160 lbs and the bike 30, then the scale will read 114 pounds or thereabouts. The front axle is the datum. If the wheelbase is 40 inches, or one meter, then the balance point is 24 inches aft of datum.

This is your personal center of gravity.  If you have any questions, watch a video on how to calculate the center of gravity for a small airplane. It is exactly the same.

Open Source Bicycle Design, Where to Start

CENTER OF GRAVITY IS THE KEY

A BIKE WITH MOTOR AND BATTERIES ADDED

A BIKE WITH MOTOR AND BATTERIES ADDED

TAKING A STORE BOUGHT BIKE AND ADDING MOTORS AND BATTERIES CHANGES THE CENTER OF GRAVITY UNLESS YOU SIT ON THE MOTOR AND WEAR THE BATTERIES.
That is not practical. However, the structure needed to connect these new components can be easy to do. The drive components, however, are another story.

LOVEBOAT OFF TO RIDE ACROSS THE COUNTRY

Loveboat Fully detailed plans of the most efficient, fastest tandem ever. For expert metalworkers only

Loveboat
Fully detailed plans of the most efficient, fastest tandem ever. For expert metalworkers only


Loveboat all set for twentieth anniversary ride across America. First done in 1995 in three months, the repeat ride shoves off during the full moon in May.
We had such a good time on the last ride, we decided to repeat the same route and visit the same people.

ROBOBIKE IS LGBT FRIENDLY. Queer or straight, x or y chromosomes, makes no difference to us.

Voyager Parts

DESIGN, BUILD, RIDE

DESIGN, BUILD, RIDE


Machined parts are now available for the modular aluminum bike we call VOYAGER.
Send email to Bonita for details.

Controllers and Warranty Repair

E_SYSTEM

CONTROLS

Robobike Home
There are two types of ebike riders in the world. The first group is comprised of those who have electronic controllers, meters, or other devices that have quit working for some reason. The second group is comprised of those riders who will experience a failure in the days to come.

Obtaining warranty repair is usually not possible.
We here at Robobike have established working relationships with some of these suppliers who encourage our efforts to repair or at least evaluate components for possible warranty service. YOU, as an end user, stand little to no chance of obtaining warranty service on your own.

We service BMS and Protection modules, DC-DC converters, boost converters for solar charging, mains charging,  J1772 charging. Motor controllers, and data acquisition systems.

To obtain an evaluation of your board repair needs, send an email to

Knuckles@Robobike.com with a description of your needs. Our staff will first contact the manufacturer for warranty repair and then give you an idea of the success rate, cost and timeline for such repair. We also repair in-house for all types of digital and analog circuits. A wise man once said, “In the end, it’s all analog”.

DESIGN, BUILD, RIDE YOUR OWN CUSTOM BIKE

Warranty Help for Chinese made electronics
Robobike has kits, much like the Erector Sets ™ of old that allow for the design, modification and fabrication of bicycles/tricycles/quadcycles of any shape and size. A collection of tubes with an assortment of bottom brackets, head sets, drop outs and doublers offer the builder a chance to build to his heart’s content. Build, ride, change, build, ride, change, etc etc. You get the picture.

We now have developed a catalog of pieces to help those of you interested in DIY bikes, particularly battery powered two wheelers.

…we will send you a catalog if you want it. Just send an email and we can get you one.

Like us if you want but please don’t follow us.

We have given you a set of links to our past efforts. Robobike no longer builds custom bikes or kits on demand.  We are now entirely Electric Bikes.

 

8 thoughts on “DESIGN, BUILD, RIDE YOUR OWN CUSTOM BIKE

  1. Elizabeth

    My 7th grade science class is building four electric bikes but they want to build the frames, everything, and not just hang a motor on a mountain bike.
    Is your book available as an eBook? If so, please contact me at the email address I used. Please.

    Reply
    1. ROBOBIKE Post author

      Ms. Elizabeth
      It is quite a feat to build one much less four ebikes and though certainly possible, it is unlikely a seventh grader has the skills needed to pull it off alone.
      Do you have a work place?
      Do you have experience bike mechanics with the time and desire to help?
      It is a wonderful idea. The ebook ( How Much Does It Weigh?) is on its way via email off-line. Please do not share it with others.
      Contact me if you need help, we are there for you.
      Bonita

      Reply
  2. Matt W.

    I understand that you have some design guidelines available for download. I’m looking for torsional rigidity and section modulus for your materials.
    Where can I get these?
    thank you …Matt

    Reply
    1. krilson Post author

      Matt
      Yes, our catalog of parts available for purchase is full of the engineering data you cite. We find it helpful to show equivalencies among materials such as aluminum vs steel.
      The latest edition of the catalog is not ready for distribution as we have discontinued many items due to low interest. We now have modular designs for the DIY crowd plus a section on custom parts such as headsets. I’ll let you know when it is ready for distribution.
      Bonita

      Reply
  3. John

    Brilliant. Range anxiety solution. Exactly what bikes need. Good ideas.. How many MPG?. Where did you get such a light generator? I’ve had something like this in the works, waiting for warmer weather. I hope to be the proud father of an E-bike motor someday, I was going to use bamboo for frame but this looks more sturdy.. I’ll stay tuned

    Reply
    1. Bonita

      Thank you for the kind words. Good luck with your motor, we have a number of original designs here in the shop.
      Bamboo seems to be a good choice for structures, more so than most people think.

      Reply
  4. River

    good day,

    I was directed to the Made in Portland,org listing of frame builders, from around here and wanted to see if you can modify my Surly LHT frame, so it can accept Gates Carbon Belts… Surly actually makes a coupling for their travel bike, but not on the rear chainstays:( how much would that cost… building a coupling for the rear chainstay like theirs please?

    best regards,
    River

    Reply

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