Ecotric 20" Folding Fatbike Motor Upgrade Fail.

[harryS]

FYI. Can't do it with a standard 175mm motor. The dropout width is 175 mm ffrom the outside of the frame, not the inside of the frame. I did manage to squeeze a MXUS XF-15 motor into my frame, but the disk brake rotor was off by 5mm.

I could take some metal off the caliper, but I wanted to be able to swap wheels as needed. One wheel and motor would have the MXUS motor with 20x 80mm rim and snow tires, and the other would be the stock motor with 20x60mm and smaller tires. I hate changing tires, but willing to change wheels. Strange whims.

So that ends this project. By the way, the MXUS XF15 is a bige motor compared to what came on the Ecotric.

 

[Cal000]

Just throwing this out there
I saw a video where someone was changing out the motor on a sondors fat bike and what they did was take the motors out of the cases and do the swap that way. The motors were both bafang fat motors and were using the same case
Wondering if something like that was possible.

 

[harryS]

The frame on the Ecotric is too narrow for a typical 175mm fat bike motor. It only takes what what Ecotric used. Which is not bad.

I had salt get inside my 26" fat tire bike's motor. Already corroded the speed sensor. It will probably attack the postion sensors. If so, I'll have this one for a spare.

 

[Cal000]

Are you gonna try again with a different motor

 

[Cal000]

What do you think about the ecotric 48v versions as an upgrade.

 

[harryS]

I betcha their 48V motor is exactly the same as the 36V motor.

If you want to be going 30 mph, you probably want a direct drive motor. Accelerates slow, but spins fast. Go over to the endless sphere forum and ask for a big motor with 160mm dropouts.

I recently got a motor with 138mm spacing to fit in a 135mm frame, by dropping back to a six speed freewheel. Could have cut down my caliper mount in above case to move the brakes over 5 mm, but just didn't want to do that. I wanted to be able to switch motor/wheels at will.

 

[kmccune]

I was trying to add a 500w rear motor conversion to an old Huffy "Prospect" I may have been able to have done it with the 6 spd freewheel( I couldn't get the freewheels swapped so I got to looking at an 800 "Trek" and it popped into its dropouts like magic- the old huffy got a front-drive 500w motor( plenty of speed for its mediocre brakes) little trouble at all.
The 500 watt "Trek" conversion pulls very well with 36 volts

 

[cayacoa]

I betcha their 48V motor is exactly the same as the 36V motor.

If you want to be going 30 mph, you probably want a direct drive motor. Accelerates slow, but spins fast. Go over to the endless sphere forum and ask for a big motor with 160mm dropouts.

I recently got a motor with 138mm spacing to fit in a 135mm frame, by dropping back to a six speed freewheel. Could have cut down my caliper mount in above case to move the brakes over 5 mm, but just didn't want to do that. I wanted to be able to switch motor/wheels at will.

Maybe you can stretch the frame and make it fit?

 

[harryS]

Nahh, too risky to spread alloy frames. Three years later, Someone else is enjoying that bike with the original motor.

 

[cayacoa]

Nahh, too risky to spread alloy frames. Three years later, Someone else is enjoying that bike with the original motor.

What's the risk of doing this? I was thinking about doing that on mine. I've seen two youtube videos of dudes who replaced theirs with the ones that lectric and rad power bikes use. but no explanation.

 

[harryS]

Crack, Boom,

Maybe not for 5mm,.

 

[cayacoa]

Crack, Boom,

Maybe not for 5mm,.

oh. Gotcha. Hey did you see my message in my other thread? I can't get the display to show me the correct speed.