Motorising my old Long John

Af · november 7, 2016

A few months ago I decided I wanted to start biking to work. Being lazy and living in a hilly town, I started looking at E-bikes. I already had an old Long John (from 1941), and really like how it handles, so I looked a bit at the modern equivalent: Harry Vs. Larry’s Bullit, but the price, about the same as a used car, for the electric version, was just too high. So next step was looking for a conversion kit for my old bike. It was in real bad need of a new bottom bracket and new pedals, so naturally I started by looking for a crank motor. After being confused about the whole 8fun/Bafang stuff, I figured out that they don’t support coaster brakes, which is the only form of brake on my olde bicycle. So that solution was out of the question. Next I looked at hub motors, but because both the front and back wheel are odd ball size, I quickly hit the wall again.

Luckily @mchro pointed me towards Boxbike, who luckily had a crank motor, which supports coaster brakes. The price wasn’t too bad, so I ordered a kit consisting of a motor, pedal arms, battery, chain, controller and all the various wires. Boxbike really provided nice support. I had ordered a brake lever, which was not supported by the controller I had ordered, so they called me up, to make sure I knew what I was doing, which I obviously didn’t, and offered me a larger battery instead. They also told me to call them any time, incase I had any trouble figuring out how to mount the kit.

My bicycle loaded with goodies.

My bicycle loaded with goodies.

To have an easier time with the job, I made a small side project, and mounted a bicycle hoist in our space.

img_20161023_175844

Next step was removing the old bottom bracket, the previous owner had mounted pedals of the wrong kind for the bottom bracket, so about twenty minutes with an angle grinder later, I had the following view:

img_20161023_152551

I thought that i needed some sort of hook or c spanner, to unscrew the bottom bracket, but behind a cover plate, it turned out that I needed some sort of weird 3mm pin spanner. Which of course I didn’t have. So after a break I ended up welding an old spanner directly to the bottom bracket bearing face.

20161026_182651 20161026_182755

20161026_183302

Wohoo, on the the next problem 🙂

So the state after removing the bottom bracket looked like this.

img_20161026_183728

Sadly the motor needs just about 180 degrees to fit, which the frame obviously didn’t have.

20161026_190900

20161026_190841

So long story short, took a hack saw to the frame, and made room. And a very simple installation, and a lot of cable ties later, and my bike was upgraded with a 250W motor 🙂

img_20161026_222700 20161026_222806

Gemt under: Projekter, Udvalgte posts

Titel5 Comments

  1. Robert siger:

    Er der en mulighed for at komme forbi en dag og se cyklen da jeg overvejer det samme med min budcykel??

    Plus er lidt interesseret i at se jeres hacker space.

    Med venlig hilsen Robert

    • Anders Vestergaard siger:

      Hej Robert

      jeg skal sørge for at give jesper besked på at du godt kunne tænke dig at se den.

      Du er altid velkommen til at kigge forbi en torsdag fra kl 19-23 hvor der er åbent for alle.

      Hilsen Anders

  2. jbr siger:

    Hej Robert

    jeg plejer at cykle på den ud i spacet om torsdagen, så kig endeligt forbi.

    Mvh
    Jesper

Skriv en kommentar

%d bloggers like this: