As Amazon Associates, we earn from qualifying purchases. This means we may receive a small commission at no extra cost to you if you click through and make a purchase.
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
This nb power 20 4 0 rear review covers the NB Power 20×4.0 5000W Fat Tire Kit. It is a rear wheel conversion kit designed for fat tire bikes. The listing highlights a 5000W motor and a top speed of 100KM/H. It supports system voltages from 36V to 72V. The kit includes a TFT color display and waterproof cables. It weighs 33.1 pounds and fits 170-175mm dropouts. This spec-based look explains how these numbers affect your ride.
- 5000W motor power for high torque output
- 100KM/H top speed rating on the listing
- 36V-72V compatible Sabvoton controller with 18 mosfets
- Integrated TFT color display for ride data
- Waterproof cable system for all components
Good fit for
You should consider this kit if you have a fat tire bike with 170-175mm rear dropouts. It suits riders who want to upgrade to a high-power conversion. The wide 20×4.0 tire size is ideal for loose terrain. The 36V-72V voltage range offers flexibility for different battery setups. If you need a robust motor with a digital display, this spec sheet aligns with your needs.
Who can skip it
Skip this option if your bike frame has dropouts narrower than 170mm. The 33.1-pound weight adds significant mass to your rear wheel. You may need to upgrade your brakes and frame to handle the 5000W power. This kit is not for lightweight road or hybrid bikes. If you prefer a simpler mechanical setup without a digital TFT display, look for a more basic conversion kit.
Verdict
This kit offers high power and speed specs for fat tire conversions. It fits specific frame widths and requires compatible batteries.
Key specs explained for this kit
Motor Power: 5000W
This power rating indicates a high-output motor capable of strong acceleration and hill climbing. You will notice significant torque when starting from a stop or riding on steep inclines. This level of power suits riders who need extra assistance on challenging terrain or want faster response times compared to standard e-bike motors.
Top Speed: 100KM/H
The listed maximum speed is 100 kilometers per hour. This figure represents the potential upper limit of the system under ideal conditions. You should verify local laws regarding speed limits for electric vehicles. This high speed potential makes it suitable for open roads, though actual riding speed depends on your bike frame and safety gear.
System Voltage: 36V-72V
This wide voltage range means the kit works with various battery types. You can use lower voltage batteries for longer range or higher voltage batteries for more power. Check your existing battery output to ensure compatibility. This flexibility allows you to upgrade your power source without replacing the entire motor system immediately.
Tire Size: 20 * 4.0
The wheel fits tires that are 20 inches in diameter and 4.0 inches wide. This size is standard for fat tire bikes, providing stability on loose surfaces like sand or snow. Ensure your frame can accommodate this width. The wide profile offers better traction and a smoother ride on uneven ground compared to narrow road tires.
Dropout Size: 175mm
The rear axle spacing is 175 millimeters. You must measure your bike frame's rear dropout width to ensure the wheel fits. If your frame is narrower, you may need adapters or a different frame. Correct spacing is critical for safe installation and proper wheel alignment on your bike.
Design and Build Overview
According to the listing, this kit features a 20 by 4.0 rear wheel design. The tire size indicates a wide contact patch for stability on loose surfaces. The overall weight is 33.1 pounds. This mass suggests a robust construction capable of handling high torque, though it will add significant heft to your bike frame. You need to ensure your rear dropouts can support this load.
The system supports a wide voltage range from 36V to 72V. This flexibility allows you to match the motor to your existing battery pack or upgrade for more power. The listing notes a maximum speed of 100KM/H. This figure reflects the motor's capability under ideal conditions. You should verify local speed limits before using the full output.
Controls are managed via a 36V to 72V TFT color display. This screen provides clear data on your ride status. The kit includes waterproof cables for the entire system, which protects connections from moisture and debris. An alarm lock function is also integrated. This adds a layer of security against theft. The Sabvoton controller handles the power delivery with 100Amp DC current. This setup is built for durability and consistent performance in various weather conditions.
Setup And Everyday Use
Installing this kit requires matching the rear wheel to your bike frame. The listing specifies a dropout width of 170 to 175mm. You must verify that your bicycle fork ends fit this range before assembly. The system supports a wide voltage range from 36V to 72V. This flexibility allows you to pair the motor with various battery packs. Higher voltages generally increase top speed and power output. The included Sabvoton controller handles up to 100A of DC current. It can handle 200A of phase current for strong acceleration. Daily operation is managed through the 36V to 72V TFT color display. This screen provides real-time data on your ride. You can monitor speed and battery status directly on the handlebars. The entire system uses waterproof cables. This feature protects the electrical connections from rain and mud during off-road use. The kit also includes an alarm lock function. This adds a layer of security when you leave the bike parked. The 20 by 4.0 fat tire design offers a wide contact patch. This provides stability on loose surfaces like sand or snow. The total weight of the wheel assembly is 33.1 pounds. This mass contributes to a stable ride but may affect handling on steep climbs. The max speed is listed as 100KM/H. This figure depends on your chosen voltage and gear ratio. You should always check local laws regarding e-bike speed limits. The conversion kit replaces your existing rear wheel. Ensure your brakes and chain alignment are compatible with the new setup. Proper installation ensures the motor delivers its full 5000W potential safely.
Before You Buy This Kit
You need to verify your bike frame compatibility before purchasing this conversion kit. The listing specifies a rear dropout width of 170 to 175mm. Your bicycle must have fork ends that match this exact range. If your frame uses a different spacing, this wheel will not fit securely. You must also select the correct system voltage. The kit supports 36V to 72V batteries. Ensure your existing battery pack matches one of these voltage levels to avoid damaging the Sabvoton controller. The TFT display requires proper wiring. You should plan for professional installation if you lack electrical experience. This kit is heavy at 33.1 pounds. It suits riders who prioritize raw power over lightweight efficiency. It fits well among other high-performance options in our E-Bikes & Electric Scooters guide. Regular maintenance involves checking cable waterproofing and motor connections. Keep the area clean to prevent debris from affecting the motor’s cooling. Proper care ensures long-term reliability.
Check before you buy
- Verify rear dropout width is 170-175mm
- Confirm battery voltage matches 36V-72V range
- Ensure frame supports 33.1 pound wheel weight
- Check tire size matches your preference
NB Power 20×4.0 5000W Fat Tire Kit
Best for: high-power fat tire conversions
- Motor Power
- 5000W
- System Voltage
- 36V-72V
- Top Speed
- 100KM/H
- Tire Size
- 20 * 4.0
- Bike Type
- Fat Tire
- Weight
- 33.1 pounds
This is a rear-wheel conversion kit for fat tire bikes. It features a 5000W motor and a Sabvoton controller rated for 100A DC current. The system supports 36V to 72V battery configurations and includes a TFT color display. It is designed for riders seeking high speed, with a claimed top speed of 100 km/h. The wheel fits dropouts between 170 and 175mm.
- 5000W motor output for high power
- Sabvoton controller handles 200A phase current
- Includes 36V-72V TFT color display
- Waterproof cables for the whole system
- Heavy build at 33.1 pounds
- Fits only 170-175mm dropout widths
- Requires 36V-72V compatible battery
- You want a high-speed conversion kit
- You have a fat tire bike frame
- You prefer a TFT display interface
- You need a lightweight component
- Your bike has narrow dropouts
- You require a pre-wired system
Verdict: NB Power 20*4.0 Rear 5000W Kit suits riders prioritizing raw power and speed over weight savings. It fits fat tire bikes with wide dropouts that can support the heavy wheel.
Specifications side by side
| Spec | NB Power 20×4.0 5000W Fat Tire Kit |
|---|---|
| Motor Power | 5000W |
| System Voltage | 36V-72V |
| Top Speed | 100KM/H |
| Tire Size | 20 * 4.0 |
| Bike Type | Fat Tire |
| Weight | 33.1 pounds |
| Size | 175mm |
| Color | 20*4.0 Rear |
| Model | 13247eb2-4e4d-4dc3-b6a0-56f5e57b6fcb |
Frequently asked questions
What is the maximum speed of the NB Power 20×4.0 kit?
The listing states a top speed of 100 KM/H. This high velocity is driven by the 5000W motor output. You will experience rapid acceleration from a standstill. This speed suits riders seeking fast performance on open roads.
Does this kit fit standard bike frames?
It requires a rear dropout width of 170 to 175mm. Standard frames often use narrower dropouts. You must measure your fork ends carefully before installation. Mismatched widths will prevent proper wheel mounting and safe operation on the road.
How heavy is the NB Power 20×4.0 wheel?
The total weight is 33.1 pounds. This mass reflects the robust construction needed for high power. You will notice a significant increase in bike weight. This extra weight aids stability but makes handling more difficult when dismounted.
Is the NB Power 20×4.0 suitable for off-road use?
Yes, the 4.0 tire width provides a large contact patch. This design offers better traction on loose surfaces like sand or gravel. The high torque helps climb uneven terrain. You get stability that narrow tires cannot provide in rough conditions.
What bike type is this kit designed for?
It is built specifically for fat tire bikes. The wide 20×4.0 wheel requires a frame designed to accommodate such bulk. You cannot install it on standard road or mountain bikes without major modifications. Check your frame geometry first.
What motor power does this kit deliver?
The kit features a 5000W motor. This rating indicates very high power output for its class. You will get strong acceleration and hill-climbing capability. This power level is ideal for riders who prioritize speed and torque over efficiency.
