Upgrade fat bike 48V 750W hub motor rear wheel ??

Mysfit

New Member
Region
Europe
Hi,

I have a fat bike 48V 750W BAFANG hub motor rear wheel, i would like to increase speed.
1)At the beginning, i wanted to put 48V 750W BAFANG hub motor front wheel but 750W does not exist for front wheel but only 500W does ! Would it be a good choice to have 750W+500W with 1 or 2 controlers ?
2)Otherwise i can change my hub motor rear wheel from 750W BAFANG to 1000W or 1500W MXUS or others (1000W BAFANG does not worth it) + new controler ?

Is it a good choice to use dual motors on fate bike ?

Hope, you can help me

Cheers,
 

PedalUma

Well-Known Member
Region
USA
Two motors sounds cool. But it is not a good solution. I recall when I thought it would be a cool idea - like 4WD off-road. It would be better to sell your existing rear Bafang wheel and upgrade to a mid-drive. These use the gears of the drivetrain to multiply the motor's efforts. You want any added weight in the middle of the bike. It is like putting the big kid in the middle of the teeter-totter. This will give you the power you want with added stability while at speed. You can also go up and down curbs better.
 

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Timpo

Well-Known Member
Hi,

I have a fat bike 48V 750W BAFANG hub motor rear wheel, i would like to increase speed.
1)At the beginning, i wanted to put 48V 750W BAFANG hub motor front wheel but 750W does not exist for front wheel but only 500W does ! Would it be a good choice to have 750W+500W with 1 or 2 controlers ?
2)Otherwise i can change my hub motor rear wheel from 750W BAFANG to 1000W or 1500W MXUS or others (1000W BAFANG does not worth it) + new controler ?

Is it a good choice to use dual motors on fate bike ?

Hope, you can help me

Cheers,
What bike do you have?
 

Mysfit

New Member
Region
Europe
Unless you enjoy spoking wheels, changing a motor can get expensive. Buying a motor/wheel is expensive too, I just spoked a fat tire wheel. I should have set up a camera. It spun like a potato chip when I first put on the spokes and I wondered if this was going to be the wheel that would beat me, but within an hour, it was spinning true.

Two motors will go faster than one, but you probably need a second battery. You will need a second controller and unless you want to learn how to ride using two throttles, you need to parallel one throttle into the controllers. For riding on slippery surfaces, some people say you need two throttles. I have done a 26" fat bike 2WD to ride in snow, but didn't like riding in snow and it was better with only one motor for summer. Just for the heck of it though, I bought a front motor for the 20" fat tire and am tinking away with it. Wheel is ready.

More speed? Go to 52V. Maybe a 25A-30A controller. Don't melt anything.
Overvoltage?By keeping my motor maybe the controller and by changing the battery alone ?I do not want to change all the equipments
 

AHicks

Well-Known Member
Region
USA
City
Snow Bird - Summer S.E. Michigan, Winter Gulf Coast North Central Fl.
How much faster are you thinking? 52v will clearly add speed, but not an awful lot, especially on a fatty.

The big direct drive motors may be faster, but they are gutless at lower speeds and pulling away from a stop. Limited climbing power as well. I would say NOT a good plan on a fatty.

Harry's plan for a more capable controller is probably a good one, especially if looking for a good place to start. If your battery is up for it, a bigger controller (35 amp?) could send 12-1500 watts to your 750w motor for a big (very noticeable) temporary boost, but you'd have to be careful to avoid heating the motor up - especially when climbing.
 

Mysfit

New Member
Region
Europe
How much faster are you thinking? 52v will clearly add speed, but not an awful lot, especially on a fatty.

The big direct drive motors may be faster, but they are gutless at lower speeds and pulling away from a stop. Limited climbing power as well. I would say NOT a good plan on a fatty.

Harry's plan for a more capable controller is probably a good one, especially if looking for a good place to start. If your battery is up for it, a bigger controller (35 amp?) could send 12-1500 watts to your 750w motor for a big (very noticeable) temporary boost, but you'd have to be careful to avoid heating the motor up - especially when climbing.
My speed now is around 40/42km/h which is normal for this hub motor . I wish I have around 50/55 km/h. I know fat are not made for speed.
I live near the ocean , so there are no hills here, it is quiet flat. with forest and sand even i can climb sometimes
Upgrade battery is also planned

So, you advise me to change my controller (i do not know yet what kind of controller i have, i have to check it) without changing my hub motor ?
Any references ?

If I change controller then it will also mean a compatible lcd is required. My Lcd display is a KT LCD03.

Cheers
 
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Timpo

Well-Known Member
My speed now is around 40/42km/h what is normal for this hub motot . I wish I have around 50/55 km/h. I know fat are not made for speed.
I live near the ocean , so there are no hills here, it is quiet flat. with forest and sand even i can climb sometimes
Upgrade battery is also planned

So, you advise me to change my controller (i do not know yet what kind of controller i have, i have to check it) without changing my hub motor ?
Any references ?

Cheers
so what bike do you have?
 

linklemming

Well-Known Member
Im assuming your 48V 750W Fat Bike motor is the G60. Other than power, your speed is limited by the KV rating of the motor (rpm/volt). Adding a front motor wont fix this.

This motor can be simulated with the Grin Motor Simulator
https://ebikes.ca/tools/simulator.html

Using this simulator at 48V yields around 43km/h which matches your observation.

Upgrading to 52V yields around 44.5km/h.

You could go with a controller like the grin phaserunner which has field weakening. I am using this controller with a 52V GMAC 10t motor and was able to up the speed from 28mph to about 36mph using 10 amps of field weakening. That being said, you will be pushing ALOT of power at this speed, my system is usually doing 1500watts at 36mph.

You can go with a mid-drive as pedaluma has mentioned. The BBSHD which he has could output 1500watts and could reach the speeds you desire. Just note that his claim of the mid-drive multiplying the motor effort is actually false at the higher speeds you desire. A 42t front chainring running a 11t rear sprocket actually has a 42/11(3.8) motor torque reduction. You would likely go with a bigger front chainring so this would be even worse. That being said, 1500W output will overcome this.

Your going to need a beefy battery to handle 1500W
 

Timpo

Well-Known Member
Why is it so important ??
If you really want to keep it confidential what bike you have, that's fine.

each bike has different set ups and motors, different frame shapes, etc.

some of them have pretty good aftermarket support.

and it's much easier to know what bike we're trying to work on, rather than some "fat bike" or "mtb" or "cruiser"
 

PedalUma

Well-Known Member
Region
USA
for example, "750W bafang" doesn't tell us the whole picture.
Timpo,
I have found that someone for example looking for a charger will not give the serial number, details, or a photo of the bike. Or want to talk about where they got it. I wonder why that is? No need to reply. This is rhetorical. But, I do not want to be helpful it there is not a showing of the cards. You have good instincts.
What is the serial number of this bike?
Where and when did you get it?
Attach a photo.
 

Timpo

Well-Known Member
Timpo,
I have found that someone for example looking for a charger will not give the serial number, details, or a photo of the bike. Or want to talk about where they got it. I wonder why that is? No need to reply. This is rhetorical. But, I do not want to be helpful it there is not a showing of the cards. You have good instincts.
What is the serial number of this bike?
Where and when did you get it?
Attach a photo.
Well I don't need to know OP's bike's serial # or where they got it from, et cetera.
But knowing which bike we're talking about definitely helps.

We don't even know which kind of bike we're talking about right now.

Out of hundreds (perhaps thousands) of different kinds of fat ebikes that are Bafang powered, we're trying to give non-specific advice? 🤔
That really didn't make sense to me, and frankly I found it very hard to give any advice or ideas.
 

PedalUma

Well-Known Member
Region
USA
Well I don't need to know OP's bike's serial # or where they got it from, et cetera.
But knowing which bike we're talking about definitely helps.

We don't even know which kind of bike we're talking about right now.

Out of hundreds (perhaps thousands) of different kinds of fat ebikes that are Bafang powered, we're trying to give non-specific advice? 🤔
That really didn't make sense to me, and frankly I found it very hard to give any advice or ideas.
People with stolen bikes will search for information but will not give specific information.
 

AHicks

Well-Known Member
Region
USA
City
Snow Bird - Summer S.E. Michigan, Winter Gulf Coast North Central Fl.
My speed now is around 40/42km/h which is normal for this hub motor . I wish I have around 50/55 km/h. I know fat are not made for speed.
I live near the ocean , so there are no hills here, it is quiet flat. with forest and sand even i can climb sometimes
Upgrade battery is also planned

So, you advise me to change my controller (i do not know yet what kind of controller i have, i have to check it) without changing my hub motor ?
Any references ?

If I change controller then it will also mean a compatible lcd is required. My Lcd display is a KT LCD03.

Cheers
I can tell you that an LCD3 display only works with a KT controller. If you're bike came supplied with a KT controller, that makes it a pretty unusual bike. I didn't think any of the OEM's were using them.

From there, I agree with Harry's notes above. We'll need more info to proceed much further. -Al
 

Timpo

Well-Known Member
People with stolen bikes will search for information but will not give specific information.
ohhh... okay I didn't even think about that possibility.

yeah because that's strange OP does not want to reveal what type of bike we're talking about.
 

Timpo

Well-Known Member
Im assuming your 48V 750W Fat Bike motor is the G60. Other than power, your speed is limited by the KV rating of the motor (rpm/volt). Adding a front motor wont fix this.

This motor can be simulated with the Grin Motor Simulator
https://ebikes.ca/tools/simulator.html

Using this simulator at 48V yields around 43km/h which matches your observation.

Upgrading to 52V yields around 44.5km/h.

You could go with a controller like the grin phaserunner which has field weakening. I am using this controller with a 52V GMAC 10t motor and was able to up the speed from 28mph to about 36mph using 10 amps of field weakening. That being said, you will be pushing ALOT of power at this speed, my system is usually doing 1500watts at 36mph.

You can go with a mid-drive as pedaluma has mentioned. The BBSHD which he has could output 1500watts and could reach the speeds you desire. Just note that his claim of the mid-drive multiplying the motor effort is actually false at the higher speeds you desire. A 42t front chainring running a 11t rear sprocket actually has a 42/11(3.8) motor torque reduction. You would likely go with a bigger front chainring so this would be even worse. That being said, 1500W output will overcome this.

Your going to need a beefy battery to handle 1500W
We don't know if we're talking about G060.
But even if we are, there are 4 variants (or more) of G060.
 

Mike_V

Active Member
Just ride, and enjoy mysfit. Have some fun
If it ain't broke . . .
Your GHM (motor) won't go any faster because of the way it's manufactured by Bafang,
the windings.
 

Mysfit

New Member
Region
Europe
Im assuming your 48V 750W Fat Bike motor is the G60. Other than power, your speed is limited by the KV rating of the motor (rpm/volt). Adding a front motor wont fix this.

This motor can be simulated with the Grin Motor Simulator
https://ebikes.ca/tools/simulator.html

Using this simulator at 48V yields around 43km/h which matches your observation.

Upgrading to 52V yields around 44.5km/h.

You could go with a controller like the grin phaserunner which has field weakening. I am using this controller with a 52V GMAC 10t motor and was able to up the speed from 28mph to about 36mph using 10 amps of field weakening. That being said, you will be pushing ALOT of power at this speed, my system is usually doing 1500watts at 36mph.

You can go with a mid-drive as pedaluma has mentioned. The BBSHD which he has could output 1500watts and could reach the speeds you desire. Just note that his claim of the mid-drive multiplying the motor effort is actually false at the higher speeds you desire. A 42t front chainring running a 11t rear sprocket actually has a 42/11(3.8) motor torque reduction. You would likely go with a bigger front chainring so this would be even worse. That being said, 1500W output will overcome this.

Your going to need a beefy battery to handle 1500W
Thank you so much for your detailed reply. I did not know this kind of controllers......I am going to dig it even if it is not very cheap but why not.

Please, note that my bike is not stolen !!!What a crazy idea !!But, think what you want .I am not here to be insulted or what do I know.
I am disappointed with the disproportionate reaction of some of you.

Peace & Love brothers
 
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Daffyh

Member
Im assuming your 48V 750W Fat Bike motor is the G60. Other than power, your speed is limited by the KV rating of the motor (rpm/volt). Adding a front motor wont fix this.

This motor can be simulated with the Grin Motor Simulator
https://ebikes.ca/tools/simulator.html

Using this simulator at 48V yields around 43km/h which matches your observation.

Upgrading to 52V yields around 44.5km/h.

You could go with a controller like the grin phaserunner which has field weakening. I am using this controller with a 52V GMAC 10t motor and was able to up the speed from 28mph to about 36mph using 10 amps of field weakening. That being said, you will be pushing ALOT of power at this speed, my system is usually doing 1500watts at 36mph.

You can go with a mid-drive as pedaluma has mentioned. The BBSHD which he has could output 1500watts and could reach the speeds you desire. Just note that his claim of the mid-drive multiplying the motor effort is actually false at the higher speeds you desire. A 42t front chainring running a 11t rear sprocket actually has a 42/11(3.8) motor torque reduction. You would likely go with a bigger front chainring so this would be even worse. That being said, 1500W output will overcome this.

Your going to need a beefy battery to handle 1500W
USE this tool and discover/learn it might save you time and money.