Fat Bike High Power Motor options (3000W+)

[jonpad01]

Hey guys, I've been looking for a motor to put on a fat bike frame with 190mm rear dropout.

It seems that NBPower sells one on AliExpress, they replied to my email claiming the 5000w motor is 50H, can produce 120nm of torque, and the 3T version has a kv of 11.9, 4T version has a kv of 10.5, and they also sell a 5T. There is also a 3000w model that is 45H. These motors can use a 7 speed freewheel. The seller did claim that these are not QS motors, so I have no idea if they are worth the asking price, which is more than a QS motor on AliExpress if you don't count the shipping.

Has anyone tried one of these? Do you guys know who else is selling 3000w+ fat bike motors that can use a 7 speed freewheel, or cassette?

 

[Bullfrog]

I sent NBPower messages repeatedly asking who produces their motors and I could never get an answer. For that reason, I ended up going with a Leaf motor with a 35mm stator. It is probably some little mom and pop shop in China...that could or could not have decent quality, I couldn't find the answer.

If I ever want to run more power, I am seriously considering a Crystalyte H55100 motor. There is also a "UFO" series that is slightly different and uses the same stator...I think. The Crystalyte motors come in the current Stealth ebikes. IMO the QS205 is the most capable and best quality motor available if you are going to push the power limits on a bicycle. Make sure you improve your brakes along with the motor...I'd recommend hydraulic disc brakes and 203mm rotors as a bare minimum. Check you fork because it may have a maximum 180mm rotor...in that case I run a 180mm rotor up front and a 203mm in the rear.

 

[tdiggs]

Any reason you couldn’t go with a mid-drive kit? CYC X1 Pro Gen 4 advertises up to 250 Nm and 5,000 W. They can handle up to 120mm wide bottom brackets.

 

[E-HP]

Do you guys know who else is selling 3000w+ fat bike motors that can use a 7 speed freewheel, or cassette?

Only 2kW, but with some Statorade you could run three times that or more, while saving some weight.

26 inch 60V 2000W rear hub motor - Beach Snow Fat Tire bike conversion kit

Convert your 26 inch original beach bike to snow electric bike with leaf 26 inch 60V 2000W rear hub motor fat tire bike conversion kit.

www.leafbike.com

 

[jonpad01]

Any reason you couldn’t go with a mid-drive kit? CYC X1 Pro Gen 4 advertises up to 250 Nm and 5,000 W. They can handle up to 120mm wide bottom brackets.

This is wicked! Though it's pretty expensive.

Only 2kW, but with some Statorade you could run three times that or more, while saving some weight.

26 inch 60V 2000W rear hub motor - Beach Snow Fat Tire bike conversion kit

Convert your 26 inch original beach bike to snow electric bike with leaf 26 inch 60V 2000W rear hub motor fat tire bike conversion kit.

www.leafbike.com

I was looking at this one and it seems like a good option.


I did not realize that QS Motor sells the 205 with an option for 175mm dropout. I think I can put a 5 or 7 speed freewheel on it, though he claimed in the email that he has not heard of anyone doing that. I was able to put a 5 speed freewheel on the version with 150mm dropout using a round nut as a spacer. The axle on that side really isn't long enough though.