[RIPPERTON]

bored riding around on the worlds best commuter bike (Honda CBF250),
have finally found the optimum commuter chassis for an E-vert. 1980 CT90 ex Australia Post
This is as close as you can get to a bicycle with a compliance plate.
Got this from a wrecker friend for $200 without motor. Had to pick bits off 3 wrecks he had to make one good roller.
Bit of frame strengthening is a must, The 40x1.6mm SHS does 3 things.
1 raises the seat 70mm for my lanky butt
2 strengthens the steering head
3 gives a sturdy place to hang a battery pack from.

[RIPPERTON]

got this project going while I was waiting for KHB14801 but its now on hold as the R1 has priority.
This project is a dead ringer for a hub motor ($1,700) but as I already have this AC motor off EBay for $200 I will try to use it with the 2x 72v Kelly controllers from a recent abandoned Mountain Bike project.



Of course I have to modify everything I touch so the external fan goes in the bin and I made room for an internal fan.

[RIPPERTON]

The 6:1 reduction is overkill as far as top speed is concerned, I will need a 36t front and rear sprocket for 1:1 chain drive ratio if I assume the motor can push this bike to 65kmh

[RIPPERTON]

k the planetary motor has been chucked and replaced with a Crystalyte 5403
which hasnt been made yet.
I tacked onto the Endless Sphere group buy and ordered 2 bare hubs.
1x 5403 and 1x 5404 for $450 each. Should be here about Christmas.

[voicecoils]

Brilliant name for the electric postie bike!

Looking forward to seeing how it turns out with the hubmotor.

Another small engined, light moto which would be interesting for an electric conversion is the Sachs Madass, i'm sure you've seen it:

[RIPPERTON]

Originally Posted by voicecoils

Brilliant name for the electric postie bike!

Looking forward to seeing how it turns out with the hubmotor.

Another small engined, light moto which would be interesting for an electric conversion is the Sachs Madass, i'm sure you've seen it:

Heh I stole the name off this guy
http://www.youtube.com/watch?v=u2144LCxAik

Im working on a theory of having a high turn winding with high voltage controller. so you get good torque off the mark AND also relatively good top speed.
24-144V,200A,Brushless Speed Controller KHB14201-General Brushless Controller
This Kelly should be good for $700 and finally get to use my LifeTechs LiFePo4 in a 50s 2p pack weighing 35kg

[RIPPERTON]

Heres the pack which stradles the frame between seat and steering

[RIPPERTON]

Originally Posted by voicecoils

Brilliant name for the electric postie bike!

Looking forward to seeing how it turns out with the hubmotor.

Another small engined, light moto which would be interesting for an electric conversion is the Sachs Madass, i'm sure you've seen it:

I think youve got a point coils
and considering they are about the same price as a posty bike,
I think Ive just found a replacement for the venerable CT
much better looking and with a disc brake front and rear.
To engineer and reregister an electric conversion I still need to have
the rear friction brake and that is a lot easier to do if its a disc to start with

[RIPPERTON]

Got the footpegs on and went for a roll down the driveway and noticed the forks are pretty piss weak, they bottom easy even without an engine in.
So better not put all the cells right up front..... means redesign the pack.



Now 50s 3p, this way get to run 5 cells in series before using a busbar.
Spread the weight (55kg) more evenly toward the rear.
Means having 2 packs mirrored on either side of the bike still removable
for charging.

[RIPPERTON]

redesigning the footpegs bothered me for a long time. This is a bit ugly but does the job, will be partially covered by the pack




Front brake duties are now assigned to the original R1 clutch lever.
The original switch has been kicking around in my toolbox for the last 9 years