Author Topic: Is it possible to convert FRONT Magic Pie 2 to REAR motor?  (Read 5229 times)

Offline Marsbar

  • Confirmed
  • Magic Undergrad
  • ***
  • Posts: 65
Is it possible to convert FRONT Magic Pie 2 to REAR motor?
« on: June 11, 2013, 11:28:45 PM »
Hello, I am a new member. I bought the Magic Pie 2 motor for front installment. However, I have bought a new bicycle and want to have a REAR motor since the fork is of aluminum, and I have already broken it and welded it. So the motor now has to go in the rear wheel for safety!

So question is:

1. Is there any way of converting my FRONT motor into a REAR motor?
2.Would I need parts from Golden Motor, or could I fix this myself by buying bicycle parts at a local shop, like the 7 gear cassette.


Offline Bikemad

  • Global Moderator
  • Professor
  • PhD. Magic
  • ******
  • Posts: 5,553
Re: Is it possible to convert FRONT Magic Pie 2 to REAR motor?
« Reply #1 on: June 12, 2013, 01:26:02 AM »

Hi andto the forum.

Unfortunately, it is not just a case of screwing on a new freewheel as the side casings and axle/stator assembly are different on the front and rear motors.

If you were to purchase a rear motor unit (rather than a complete kit) and a suitable thread-on freewheel gear cluster,  it should be relatively straightforward to swap the stator/axle assembly and side covers with your existing wheel to convert it into a rear wheel.
I suspect that the spokes may need to be re-adjusted slightly to correctly centre the rim within the frame.

Alternatively, you should be able to purchase a strong set of steel front forks to fit your frame and then refit your existing front motor, adding some torque arms for additional safety. ;)

Alan
 

Offline Marsbar

  • Confirmed
  • Magic Undergrad
  • ***
  • Posts: 65
Re: Is it possible to convert FRONT Magic Pie 2 to REAR motor?
« Reply #2 on: June 13, 2013, 10:59:02 PM »
Okay, that seems to complex for me. I think it is better to leave the motor as is, and buy a new rear motor.

Here you can see the first problem I had, the aluminum fork snapped instantly, just by testing the spin of the motor. The fork tip was made of pressure molded aluminum, weak stuff! So I repaired it, welded on 7mm thick aluminum profile in front of it, sanded down welding and painted it. Looks like new, so I am happy with the repair.

Anyway, the fork is still of aluminum, and the steel pipe tube trough the frame from the fork did not impress me with thickness. So now I am afraid of installing it in front.

However, back to the old bicycle with steel frame and no damper. As you can see I welded in 4mm steel torque bars on both sides, also reduced the motor from 1000W to 750W due to road safety. (Gives me more than enough speed!)

Last picture of the old bike, I have made a battery box with the battery in bottom, and the charger on top. Box is water proof, and you don't have to mess with the charger anymore. (Box has an outside switch, charging plug on/off due to some current was drawn from the battery into the charger)

The good part is that the charger always follows the bike, and I can re-charge in electrical car parking space. The charger produces little heat as it is only 2A, so that is not a problem as the box also have some free space at top.

Also I have installed a key switch for on/off.

So, my setup is now:

750W (15A)
48V
15Ah Lithium, 2A charger

Now I hope to make a 2nd bike with a damper fork, since the roads here are so bad! Meanwhile I just have to take it easy...