48V/52V 2000W Electric Bike Conversion Kit - Brushless Gearless Hub Motor (Front / Rear) with MTX39 Rim & 40A Controller
Unleash extreme electric speed and commanding hill-climbing torque with the 48V/52V 2000W Brushless Gearless Electric Bike Conversion Kit. Engineered for high-speed commuters, trail riders, and custom e-bike builders, this direct-drive hub motor system delivers blistering top speeds up to 55–65 km/h (34–40 mph) and an impressive 91–94.6 N·m of peak torque.
Built onto the world-renowned Sun Ringle MTX39 heavy-duty double-wall aluminum alloy rim with 36 high-tensile spokes, this conversion wheel is engineered to take severe punishment on asphalt, gravel, and mountain trails. Paired with an intelligent 40A 15-MOSFET sine wave controller and your choice of advanced digital LCD/color displays (including high-security NFC card tap-to-start), turning your traditional bicycle into a high-powered electric powerhouse has never been smoother or more reliable.
Standard bicycle rims quickly buckle under the immense rotational forces of a 2000W electric motor. That is why our conversion wheel comes pre-laced to the heavy-duty Sun Ringle MTX39 rim, built with high-gauge steel spokes and reinforced eyelets. Check your bike's fork spacing before ordering:
Every kit includes ergonomic electronic brake levers equipped with micro-switch cutoff sensors that immediately kill motor power the instant you pull the brake lever, ensuring maximum stopping safety. The responsive thumb throttle delivers smooth, progressive speed modulation without hand fatigue, while the 1:1 Cadence Pedal Assist Sensor (PAS) provides natural motor assistance as you pedal.
Tailor your cockpit to your exact riding style. All displays provide real-time telemetry including speed, battery level, trip distance, power output (watts), PAS assist levels, and automated system diagnostics.
Inside the motor, premium copper stator windings and high-grade neodymium magnets ensure over 80% operating efficiency with superior thermal dissipation. The included heavy-duty controller enclosure mounts securely to your bike frame, shielding the 40A controller from road debris, dust, and weather.
| Parameter | Specification |
|---|---|
| Rated Voltage | DC 48V / 52V (Controller supports 48V–72V) |
| Rated Continuous Power | 2000 Watts |
| Motor Architecture | Brushless & Gearless (Direct-Drive Hub Motor) |
| Top Speed Range | 55 – 65 km/h (approx. 34 – 40 mph, terrain/rider dependent) |
| Rated Motor Speed | 464 – 537 RPM |
| Peak Torque | 91.0 – 94.6 N·m |
| Motor Efficiency | ≥ 80% |
| Motor Net Weight | Approximately 6.2 kg (13.7 lbs) |
| Rim Brand & Construction | Sun Ringle MTX39 Reinforced Double-Wall Aluminum Alloy |
| Available Wheel Sizes | 20", 24", 26", 27.5", 28", 29", 700C (ISO 622) |
| Fork Dropout Width | Front: 100 mm | Rear: 135 mm – 142 mm |
| Brake Compatibility | Standard 6-bolt disc brake rotor (44mm BCD) and V-brake compatible |
| Controller Specifications | 40A Maximum Current, 15-MOSFET Sine Wave (Size: 184×43×83 mm; Weight: ~740g) |
| Pedal Assist & Brakes | 1:1 Cadence PAS Sensor; Low-Level Electronic Brake Cut-off Levers |
| Maximum Weight Capacity | Up to 150 kg (330 lbs) |
Please Note: Battery, tire, and inner tube are not included. You will need a compatible 48V or 52V lithium battery with a discharge rating of at least 40A continuous current.
Q: What battery specifications are required to run this 2000W kit?
A: You need a 48V or 52V lithium-ion battery. Because the controller draws up to 40 amps, ensure your battery's Battery Management System (BMS) is rated for at least 40A to 50A continuous discharge. Using an under-rated battery may trigger BMS over-current cut-offs.
Q: How do I know whether to choose a Front or Rear wheel kit?
A: Rear wheel drive is recommended for high-power 2000W setups because rear wheel traction is superior and prevents wheel spin under heavy acceleration. Front wheel setups require a sturdy steel or rigid fork with 100mm dropouts and heavy-duty torque arms.
Q: Are 28-inch, 29-inch, and 700C rims identical?
A: Yes! All three share the exact same rim diameter standard (ISO / ETRTO 622 mm). Whether your frame uses 700C road tires, 28" commuter tires, or 29" mountain bike tires, this rim will fit properly.
Q: What is the benefit of a gearless direct-drive motor over a geared motor?
A: Direct-drive motors have only one moving part (the rotor spinning around the stator) with no internal planetary nylon gears. This means virtually silent operation, zero mechanical gear wear, regenerative braking capability, and exceptional long-term reliability at continuous high speeds.
Q: Can I use hydraulic disc brakes with this conversion kit?
A: Yes. The hub motor features standard 6-bolt disc rotor mounting holes (44mm BCD). If your bike uses hydraulic brakes, you can install optional hydraulic brake cutoff sensors or keep your existing hydraulic levers while relying on the throttle and PAS.
Q: What warranty and support does E Smart Way provide?
A: The motor includes a full 1-year manufacturer warranty, and electronic components and accessories include 3 months of replacement coverage. E Smart Way provides storewide free shipping and full transit protection.
Free Global Shipping: Every kit is professionally packed and rigorously bench-tested prior to dispatch. Tracking numbers are provided as soon as your shipment is processed.
Import Taxes & Customs: Depending on your country or region, international shipments may be subject to local import duties, VAT, or customs clearance handling fees assessed by your destination customs authority. These charges are the recipient's responsibility under standard international trade terms.
Carrier Clearance: Please ensure your delivery address and phone number are accurate so your local courier (e.g., DHL, FedEx, UPS, or national postal carrier) can contact you promptly for customs clearance if required.
48V52V 2000W Electric bike Conversion Kit Brushless Gearless Rear hub Motor Wheel 20-29inch 700C MTX39 Rim for E Bike Kit
Looks good , i buyvthe rear wheel with no cassette , only thread midel i will put my own single gear ,
