A 50 mph electric bike kit is a high-power conversion setup, but the listed options vary substantially in voltage, motor output, wheel size, and stated speed. The NBPOWER kit is the strongest high-speed conversion candidate based on its listed 3000W rating and claimed 100 km/h speed. For more moderate conversions, the 48V 2000W kits offer lower stated speeds, while the 9000W dual-motor bike is a complete electric bike—not a conversion kit—and lists a 45–50 mph maximum.
| Product | Best suited for | Key stated detail |
|---|---|---|
| NBPOWER 3000W Kit | High-speed conversion projects | 48V–72V; claimed 100 km/h |
| 72V 2000W Hub Kit | High-voltage DIY builds | 60 N·m torque; 560 rpm |
| 48V 2000W Rear Kit | 20 × 4-inch wheel builds | 34 mph no-load speed |
| 48V 1000W Rear Kit | 26-inch wheel conversions | Up to 33 mph stated |
| 9000W Dual-Motor E-Bike | Buyers seeking a complete bike | 45–50 mph claimed |
NBPOWER 3000W High-Speed Conversion Kit
This is the most directly relevant option for a high-speed conversion project. The listing describes a 48V–72V, 3000W kit and claims a top speed of 100 km/h, approximately 62 mph. It includes a sine-wave controller with a controller bag and a TFT UKC1 color display.
Best for: Experienced builders seeking a high-power rear-wheel conversion and a display-equipped control setup. It was selected because its stated power and speed claim are the closest match to a 50 mph search.
Check before buying: The listed rear dropout spacing is 135 mm. Confirm the bicycle’s frame spacing and other component requirements before choosing this kit. The listing details provided do not specify a complete compatibility checklist or installation instructions.
72V 2000W Hub Motor Conversion Kit
This rear hub kit uses a 72V, 2000W brushless, gearless motor. Listed specifications include 60 N·m torque, a 560 rpm motor speed, a multifunction LCD, pedal-assist sensor, and seven-speed gearing. The package description says it includes handles and a controller bag, along with an installation manual.
Best for: DIY riders looking for a high-voltage 2000W conversion with pedal assist and a display. It offers more voltage than the 48V kits in this comparison, but the listing does not provide a verified top speed.
Check before buying: Confirm the wheel, frame, battery, and controller requirements for the specific build. Do not assume the 72V rating alone means the finished bike will reach 50 mph.
48V 2000W Kit For 20-Inch Fat Tires
This rear-wheel conversion kit is designed for 20 × 4-inch wheels. Its listed features include a 48V, 2000W motor, five speed settings, fixed-speed cruise, an LCD showing speed and mileage, and pedal-assist or pure-electric riding modes. The stated 34 mph figure is a no-load speed, not a guaranteed riding speed.
Best for: Riders converting a compatible fat-tire bike who want multiple riding modes and an LCD. It was selected as a higher-power option with a clearly specified wheel size.
Check before buying: Avoid this option if your bicycle does not use the stated 20 × 4-inch wheel size. Its listed no-load speed is below 50 mph and does not establish that the kit will reach that speed under load.
48V 1000W Kit For 26-Inch Wheels
This 26-inch rear hub kit lists a 48V, 1000W brushless gearless motor, 45 N·m torque, and speeds up to 33 mph. The package description includes a thumb throttle, pedal-assist sensor, power-off brake levers, controller bag, and mounting hardware. It also lists a 265-pound load capacity.
Best for: Riders prioritizing a specified 26-inch wheel and a described set of DIY components over a 50 mph target. It provides useful comparison context, but its stated speed is well below that target.
Check before buying: Avoid it if 50 mph is essential. The listing’s maximum speed claim is up to 33 mph, and the stated load limit should be considered for the rider and carried load.
9000W Dual-Motor E-Bike
This is a complete electric bike, not a conversion kit. Its listing describes dual motors with 9000W combined peak output, a 52V 30Ah removable battery, and a claimed 45–50 mph in PAS Level 5. It also lists a 1000-lumen headlight, turn signals, and brake light.
Best for: Buyers who want a ready-made high-speed electric bike rather than a bicycle conversion project. It is included because its stated speed range directly matches the search intent.
Check before buying: Avoid this option if you specifically need a kit to convert your existing bicycle. The claimed range and speed can vary with terrain, rider weight, and riding conditions, according to the listing.
Buying Guide: Choosing A High-Speed Electric Bike Kit
Does the kit actually claim 50 mph?
Compare stated speed figures carefully. The NBPOWER listing claims 100 km/h, while the 48V 2000W kit lists 34 mph at no load and the 1000W kit lists up to 33 mph. A motor’s wattage or rpm does not, by itself, confirm a real-world top speed. Look for clear speed conditions and remember that rider weight, terrain, battery charge, and setup can affect performance.
Will the motor fit your bicycle?
Match the kit’s wheel size and rear dropout spacing to the bicycle. The products here specify 20 × 4-inch wheels, 26-inch wheels, or 135 mm rear dropout spacing. Also check that the kit’s included components meet your build needs; do not assume every necessary part is included unless the listing says so.
What power and controls do you need?
Higher-voltage and higher-wattage kits target different builds from a 48V 1000W setup. Compare the motor rating, stated torque, controller information, display, throttle, pedal-assist sensor, and brake components. Treat these as separate specifications rather than assuming one guarantees a particular speed.
Is a complete electric bike a better fit?
Choose a conversion kit if you want to modify a compatible bicycle and are prepared to check fit and installation requirements. Choose a complete bike if you prefer a factory-assembled option; note that the 9000W model is not a kit.
What should US riders check before riding?
Before purchasing or operating a high-speed electric bike, check applicable state and local rules, where the bike may be ridden, and any equipment or licensing requirements. Confirm that the intended bicycle and components are appropriate for the planned speed, and use suitable protective gear.
Frequently Asked Questions
Is there a kit here that claims a speed above 50 mph?
The NBPOWER 3000W kit lists a claimed 100 km/h top speed, approximately 62 mph. This is a product claim, not a guarantee of the speed a completed bicycle will reach.
Does a 2000W kit automatically reach 50 mph?
No. The listed 48V 2000W kit specifies a 34 mph no-load speed. Motor wattage alone does not establish a finished bike’s top speed.
Which option is specifically for 20-inch fat tires?
The 48V 2000W rear-wheel kit is listed for 20 × 4-inch wheels. Verify the bicycle’s wheel and frame fit before ordering.
Is the 9000W model a conversion kit?
No. It is listed as a complete dual-motor electric bike with a claimed 45–50 mph speed in PAS Level 5.
What is the first fit detail to verify?
Check wheel size and rear dropout spacing against the exact kit specifications. Also confirm the required electrical components before starting a conversion.