SPECIFICATIONS
QS205 72V 5000W Electric Fat Bike Rear Hub Motor Conversion Kit
170mm / 190mm Dropout • 20” / 24” / 26” x 4.0” • Fardriver ND72680 Controller
⚡ Extreme Power | 💪 Massive Torque | 🏔️ Mountain & Snow Ready | 🔥 Up to 10,000W Peak
Take your fat bike build to the next level with the QS205 72V 5000W rear hub motor kit, designed for extreme terrain, heavy loads, and high-performance riding. Paired with the Fardriver ND72680 sine-wave controller, this system delivers smooth acceleration, massive torque, and professional-grade reliability.
Choose between 3.5T, 4T, or 5T windings to match your riding style — whether you want top speed, climbing power, or the perfect balance of both.
🔄 Winding Options Explained (Very Important)
| Winding | Best For | Characteristics |
|---|---|---|
| 3.5T | High Speed | Fastest top speed, lower torque |
| 4T | Balanced | Best mix of speed & torque |
| 5T | High Torque | Strong climbing power, heavy loads, lower top speed |
👉 If you ride in mountains, carry heavy loads, or ride off-road often, 5T is best.
👉 If you want speed, choose 3.5T.
👉 For all-around use, 4T is the best choice.
📦 What’s Included
🛞 QS205 72V 5000W Rear Hub Motor (170mm or 190mm dropout)
🛞 Fat Bike Alloy Rim – 20” / 24” / 26” x 4.0”
• Default: 80mm width
• 100mm available on request
🎛 Fardriver ND72680 Sine Wave Controller
🕹 Motorcycle Full Twist Throttle with Switches
📟 DKD Display
🔌 Main Wiring Harness
⚡ DC Converter
⚙️ Single-Speed Freewheel (other options available)
📡 Bluetooth Adapter (if not built-in)
🛡 M16 Torque Arm
🔑 Key Ignition
⚡ QS205 Motor Specifications
| Feature | Specification |
|---|---|
| Motor Type | BLDC In-Wheel Hub Motor |
| Motor Design | Double Axle with Integrated Rim |
| Rated Power | 5000W |
| Peak Power | Up to 10,000W (short bursts) |
| Rated Voltage | 72V |
| Wheel Sizes | 20” / 24” / 26” |
| Dropout Width | 170mm or 190mm |
| Brake Type | Disc |
| Waterproof Rating | IP65 |
| Max Efficiency | ~91% |
| Hall Sensors | Dual hall set, waterproof |
| Phase Wire | 2 × 5mm² |
| Phasing Angle | 120° |
| Temperature Sensor | KTY83/122 |
| Working Temp | 70–120°C (Peak 150°C) |
🚀 Speed by Winding
| Winding | RPM |
|---|---|
| 3.5T | 840 RPM |
| 4T | 770 RPM |
| 5T | 650 RPM |
💪 Max Torque by Winding
| Winding | Max Torque |
|---|---|
| 3.5T | 180 Nm |
| 4T | 200 Nm |
| 5T | 220 Nm |
🎛 Fardriver ND72680 Controller Specifications
| Feature | Specification |
|---|---|
| Model | ND72680 |
| Battery Voltage | 72V |
| Peak Battery Voltage | 88V |
| Supported Motor Power | 4000W – 6000W |
| Peak DC Current | 350A |
| Peak Phase Current | 680A |
| MOSFETs | 24 |
| Controller Type | Sine Wave BLDC |
| Case Material | Aluminum |
| Communication | Hall Sensor |
| Programmable | PC & Smartphone |
| Weight | 2.5 kg |
| Size | 181 × 119 × 61 mm |
🚴 Perfect For
✔ Fat bikes
✔ Snow bikes
✔ Sand riding
✔ Mountain terrain
✔ Heavy riders
✔ Extreme torque builds
✔ High-speed builds
✔ Off-road conversions
⚠️ Important Notes
❌ Battery not included
🧰 Professional installation recommended
📏 Frame must support 170mm or 190mm dropout
⚡ High-power system – for experienced riders
🚫 May not be street legal in some regions
🔥 Why Choose This Kit?
⚡ 5000W rated power
🔥 10,000W peak bursts
💪 Up to 220Nm torque
🎯 Multiple winding options
🔇 Smooth sine-wave control
📱 App programmable
🏔️ Extreme terrain ready
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