Q:Just a quick question. What is the tooth count on the freewheel sprocket?
A:16T or 18T
Q:Do you know which one? I may want to change it to a different tooth count.
A:Please click below site. This kind of single cog. (If you told us before shipment. We can put this one in parcel for free.
Q:I still wasn’t sure what front chain wheel to rear cog combination would work best with this motor. I can get the cogs here easily.The hub motor arrives today. Well done as always! Hey, I need the Kv for the motor in RPM/V and the number of pole pairs for my controller.
A:about 19 rpm/ V, 46 pcs magnets (23 pair)
Q: I am finally setting up the new bike motor. I assume the 750w is a 48v based version so the rpm if we use the provided figure kV figure of 19 rpm/V is around 912 rpm. Am I correct?And what is the max phase current on the motor?
A:We didn’t test this hub motor on machine. We worry load it that will break this bike motor.
So don’t know max current.
max phase current is about = 1/3 of max current.
Q:Thank you for explaining max phase current but can you approximate what your other similar hub motors had for a max current and then I can approximate from there. I need it to complete setting up the controller.
For example, what is the 4T 750w 48v max current or what is the 1000w 48v 4T max current, etc. From there we can get pretty close to what it is.
I am doing lots of diagnostics and see that my bike motor is maxing out at around 731 rpm. Why am I not getting 912 rpm?I am getting a max rpm of 763. I am using a 52v battery.
A:For example: 1500w 4T no load speed is about 610rpm @48v works with square controller
1000w 4T no load speed is about 720rpm @48v works with square controller
I think your 4T hub motor max about 830rpm no load speed works with square controller
If works with sine wave controller, 10% slower than square controller, about 747rpm no load speed.

Q:Please send me a quote for this 20 inch 48 V 52V 1500 Watt rear hub motor laced to a 20 inch double wall rim with 1.75 inch tyre.
few questions:
-what is the overall diamater ( mm ) of the 20 inch rim with 1.75 inch tyre ?
-what is the dropout distance of the axle ( mm ) ?
-please send me a schematic wiring diagram of the cable wires.
-estimated delivery by standard sea freight to Sydney, Australia.
-estimated delivery time ( weeks ).

A:This 20 inch BMX rear bike motor is fit for about 110mm rear dropout. (The dia. of shaft is 14mm, 14mm screw nuts, flat is 10mm that fit for 10mm)
Please click below site.
https://www.leafbike.com/products/e-bike-hub-motor/bmx-20-inch-48v-52v-1500w-rear-hub-motor-electric-bike-wheel-1264.html
If your tire is 20 x 1.75. When you order, tire size,choose: 20 x 1.5″ / 1.75″ / 1.95″
Total size of 20 inch rim is 420mm (about 16.5″)
There is one cable from bike motor with 3 heavy green,blue,yellow wires and 5 thin red,black,green,blue,yellow wires.
It takes about 10 days to deliver in Sydney, Australia.

Q:yes I think the Power Circle 20 inch rim with 1.75 inch tyre will suit my escooter rear frame.
My rear frame dropout is 135 mm, can you replace the 110 mm axle dropout with a 135 mm axle dropout.

The hub motor looks like it has a lot of torque (N. m), do you have torque arms that can fit on each side of the axle flats.
This will allow me to fix the torque arms to my rear frame to stop the axle spinning backwards under hard acceleration.

Do you have a wiring schematic for all the wires coming out of the hub motor so I can check which wires needs to connect to my Crystalyte Controller.
Is there a wire for the hub motor temperature sensor.

thanks for assisting with my inquiry.

A:Please click below site.This bike motor is 135mm dropout.
https://www.leafbike.com/products/e-bike-hub-motor/20-inch-48v-52v-1500w-rear-bike-motor-wheel-1016.html
We don’t have torque arm now.
We have NTC-10K and KTY84-130 two kinds of temp.Can choose one of them install into motor.Will come out a white wire.

Q:What is the temperature of the two types of wire… Which one is suitable for the hub motor?

A:Both of them are suitable for the hub motor.
That depends on your controller & LCD reads which temp, NTC-10K or KTY84-130

Q:I have a Crystalyte 48V Controller from China and my display is a Cycle Analyst V3 from Grin Technologies in Canada.

which temperature sensor and wire should be selected.
what is the maximum temperature degree Celsius the hub motor can operate to without damage or burn out.
Our weather is very hot in Summer season and a lot of my customers have burned out their hub motors because of high temperature when riding up hills.

Q:My new hub motor kit is all hooked up as directed an error 7 keeps popping up. I checked the wires all tight an right and still error 7.
A:Don’t care error 07.After work for 2 seconds.It will be off.
Q:Does not go off
A:If always error 7.Please check white plug’s red,black,green,blue,yellow wires.
Q:Have checked all wires an are tight and correct still error 7. So has to be bad bike motor.So what happens now refund or send me a hub motor that works.
A:Impossible to have issue for hub motor.
Q:I will try what you say with white wire an yes possible motor not work because this one doesn’t work I will get back to you on this if works fine if not we have a refund coming to me for bike motor at least.
A:Disconnect this big white plug. Motor still can work, but with error 07.
So should check this white plug ‘s each wire, each pin.
After each pin is good, each wire is good. Plug this big white connector to controller, then error 07 will off.
Q:Got error 7 off an right direction in pas 2 but switch to pas 3 an now don’t work at all no error 7 or anything just don’t throttle in any pas.
A:It doesn’t matter with PAS.
Could you take a video for this issue? Thanks.
Q:Hub motor made a electric sound but didn’t move an I’m not a video tech.
Disc is on left it’s not installed an bike is upside down an motor run right direction then wired all back an tried throttle a motor worked shut off an turned back on no errors on screen but now no throttle.
A:P09 must be “0” (Be 0, motor stops, turn throttle, motor works)
If be 1, throttle not work. Must push wheel, after wheel turn, turn throttle, motor works.
P10 must be 2. （If be 0, throttle Not work.)
Press “up” and “down” togehter. Then set P 01 , P 02…
Please check P09, P10
P 09 = 0
P 10 = 2
Q:Thank you the 0 on p9 worked all is working now wow thanks a lot.

Q: When I have put on the washers and Shimano cassette lock ring the dropout spacing goes from 135mm to 140mm. Is this normal? It is a tight fit in an aluminium mountain bike frame and I have to press a bit with my thumbs but it does go in ok and then the wheel spins fine. Does this sound ok?

A: This cassette version hub motor should reach about 137~140mm.
It’s normal.

Q: Many thanks for a great bike motor and fast reply to emails. Just posted a rave review. Only issue is many ebikes could do with more info. regarding programming for hub motor controllers and displays.
I’m trying to program for a KT-LCD3 display so can you tell me the
P2 Wheel Speed Pulse Signal Setting (pulses per revolution)
C2 Motor Phase Classification Coding Mode (I’m using a KT sine wave controller)

I’ve already got this manual and it does NOT tell me the specific answers to my 2 questions. Please pass my questions on to one of the electrical engineers at Leafbike.

A:
P manual comes with LCD.
Set P as below:
P1= 46
P2= 0
P3= 1
P4= 0
P5= 15
Don’t set C.

Q: Thanks and will try out the settings.

Q: I am looking for a rear hub motor, however I can not find in your website. I need a rear bike motor installed in the rim. My rear wheel tire is 27.5” x 2.4”. I am looking for only 1000w 48v.
 If you have in stock, please send me the link so I can go forward with a purchase.

A: Please click below site.
Rim is 32mm width. Fit for 27.5 x 1.95″ ~ max 2.4″
https://www.leafbike.com/products/e-bike-hub-motor/27.5-inch-48v-52v-1000w-rear-bike-motor-wheel-1374.html

Q: Thank you for your response. I have a question for you. What is the sprocket type? I am looking for a freewheel sprocket. 

A: Default: freewheel

Q: Before I begin to purchase a new hub motor I want to mention something. 4 years ago I ordered a 48v 1000w 700c rear wheel bike motor e bike kit from leaf bike,  and I still have it till this day….I enjoy using it and I am having a lot of fun with it and I want to keep it….I recently ordered a brand new bike and I really want to exchange my original e bike kit into my new bike, however my new bike is on a different size rim (27.5” x 2.4”). 
I have begun this project of mine and I am facing a problem with my spoke install. I ordered 36 x 170mm spokes from a bike store, installed the 1st and 2nd set of spokes easily, however, to do the 3rd and 4th set is impossible as I can not reach the rim hole. I noticed on your website that size 170mm spokes are the correct size length, they are 12 gauge, I followed the exact same spoke  pattern as the 700c wheel, yet I have no success. What am I doing wrong? 

A: 700c rim is about larger than 27.5 inch
27.5 inch is a little than 26 inch

Q: Cengalo is a Startup for a 4 wheeled lightweight car with 2 bike Hub motors on the rear wheels.
We plan a speed of approx 75 Km/h, downhill, with 20 inch wheels.
Can you offer the 48V 52V 1500W front spoke hub motor – electric bike motor with appox 800 rpm?
Motor type: brushless bike motor
Voltage: 48V / 52V
Power: 1500W
Max efficiency: 90.5%
RPM: 600
Mechanical brake: V
Cable location: shaft end, Left
Cable length:150cm / 60″
Install: spacing of 100mm fork
Noise: < 60 db Surface: Black painted Net weight: 6.9kg / 15.2 lbs Gross weight: 7.8 kg ( after packing ) A: 48V 52V 1500W front spoke hub motor - electric bike motor with appox 600 rpm. It's very fast. (Default the fastest) But also, we can make faster bike motor (over 700rpm) Q: The higher speed hub motor can be interesting for the vehicle. Than we can use 48V battery. We have yet to decide if the vehicle is 48 or 72 volts batteries. With the higher voltage (72V) battery, the same hub motor would have a 1.5 times higher speed. Do you have experience what is better for the car? A: This 1500w bike motor max use about 2.5mm phase wires. Can work with 72v battery. But uphill,if cable too hot,should stop at once. Q: Can you give a wholesale quote for the 1500W front spoke hub motor 100 psc / 500 pcs / 1000 pcs per order? We calculate the Cangalo Smartcar with this offer. Unfortunately we can't place an order until 28.2. We have to develop the vehicle, Cengalo Smartcar, first. You always answered quickly and hopefully will continue to do good prices in the future, so we can well imagine ourselves with Leafbike as a long-term supplier work.