title: Kirbebike's 72V 4000W Extreme Performance Ebike Motor Kit for MTB and Fat Tire Bike 55MPH+
source: https://kirbebike.com/products/72v-4000w-high-power-ebike-kit?variant=44834034286745
author:
- "[[KirbEbike]]"
published:
created: 2025-05-01
description: Transform your ride with the ultimate KIREBIKE 4000W kit. Features a 72V motor, 110Nm torque, 80-90km/h speed, and premium LG/Samsung battery. Professional-grade power for extreme performance and off-road adventures.
tags:
- HobbiesKirbebike's 72V 4000W Extreme Performance Ebike Motor Kit for MTB and Fat Tire Bike 55MPH+
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Free shipping
Easy installation
1-year warranty
VAT included
Free Shipping
$1,870.00
Power: 4000W Peak Output
Included 1YR Manufacturer Warranty
Free Shipping
55+ MPH | Extreme Performance Mode (PAS 5)
Est. Mile Range: 40-80KM
Wheel:20*4.0 Fat 7s 175mm Dropouts
Battery:84V Fully Charged 72V 20AH lithium battery with 5A fast Charger
Quantity:
Note:
1）Delivery time frame is between 2-7 business days.
Free Accessories Included
Introducing the MTX PRO [4000W] Kit—the ultimate performance converter that pushes the boundaries of electric power. This professional system features a groundbreaking 4000W brushless motor delivering 110Nm torque and incredible speeds up to **80-90 km/h**, backed by premium 72V 20Ah LG/Samsung battery technology.
Built with military-grade waterproofing and advanced **60A FOC control system**, the MTX PRO [4000W] ensures uncompromising performance in any conditions. The MTX 39mm reinforced rim and heavy-duty components are engineered for maximum durability and power delivery.
For riders who demand absolute peak performance, the MTX PRO [4000W] Kit is your definitive choice for dominating any terrain.
Note: Speed capabilities shown are for off-road use only. Always ride responsibly and follow local regulations.
Free shipping to the UK, US, and EU countries.
Orders shipped from China are sent via DHL Express, FedEx, TNT, or airmail. Please note: When ordering an e-bike kit, the battery is shipped separately.
DHL, FedEx, TNT, etc. - Orders typically take 5-14 business days to reach most locations and may take longer in remote areas.
power output
4000W motor wheel
Battery Specs
72V 20AH LG Lithium Battery
top speed
55MPH+ Max Speed
ride range
40-80km Mile Range
motor weight
9.8kg Motor Weight
Install Time
50 Minutes Convert Your Bike
Voltage Peak
84V Full Charged
charging
4hr 35m Fast Recharge
durability
800+ Times Cycle Life (Long-Lasting)
torque
110Nm Max Torque
Competition-Level Performance
EXTREME-GRADE 4000W POWERHOUSE
Unleash unprecedented speeds of 55+MPH and massive 110Nm torque with the KirbEbike 4000W Conversion Kit. Dominate steep climbs and conquer rough terrains with professional-grade torque output. Powered by an advanced 72V brushless direct drive motor and precision FOC sine wave controller, it's engineered for extreme commuting and off-road adventures.
4000W
Peak Power
55+MPH
Max Speed
110Nm
Torque
72V
Architecture
Engineered For Extreme Performance
High-Capacity Power System
Powered by LG/Samsung cells, our 72V (84V full charge) 20AH battery delivers an impressive 40-80km range, 4hr 35m fast charging, and 800+ charge cycles. Military-grade construction with advanced thermal management ensures maximum reliability. Intelligent BMS system provides real-time monitoring and protection. Experience a 3-year lifespan, 60A max discharge for full 4000W compatibility, and professional-grade design.
40-80km
Range
800+
Cycles
4hr 35m
Fast Charging
60A
Discharge
Performance Without Compromise
Smart power solutions balancing capability, compatibility and convenience
Pro Kit
Price Range
Premium
Motor Power
4000W
Installation Time
50 mins
Battery System
72V (84V)
Weather Protection
IP54
Smart Protection
Smart BMS + Fuse + Temperature
Frame Compatibility
1s Sprocket
Performance Output
60A
Max Speed
50+ MPH
Entry Kit
Price Range
Entry Level
Motor Power
2000W
Installation Time
30 mins
Battery System
52V (58.8V)
Weather Protection
IP66
Smart Protection
Basic BMS + Fuse
Frame Compatibility
7s, 8s, 9s, 10s, 11s, 12s Sprockets
Performance Output
40A
Max Speed
34-38 MPH
Premium Kit
Price Range
Mid-Range
Motor Power
3000W
Installation Time
30 mins
Battery System
60V (71.4V)
Weather Protection
IP66
Smart Protection
Smart BMS + Fuse + Temperature
Frame Compatibility
7s, 8s, 9s, 10s, 11s, 12s Sprockets
Performance Output
50A
Max Speed
45+ MPH
Pro Kit
Price Range
Premium
Motor Power
4000W
Installation Time
50 mins
Battery System
72V (84V)
Weather Protection
IP54
Smart Protection
Smart BMS + Fuse + Temperature
Frame Compatibility
1s Sprocket
Performance Output
60A
Max Speed
50+ MPH
Entry Kit
Price Range
Entry Level
Motor Power
2000W
Installation Time
30 mins
Battery System
52V (58.8V)
Weather Protection
IP66
Smart Protection
Basic BMS + Fuse
Frame Compatibility
7s, 8s, 9s, 10s, 11s, 12s Sprockets
Performance Output
40A
Max Speed
34-38 MPH
Premium Kit
Price Range
Mid-Range
Motor Power
3000W
Installation Time
30 mins
Battery System
60V (71.4V)
Weather Protection
IP66
Smart Protection
Smart BMS + Fuse + Temperature
Frame Compatibility
7s, 8s, 9s, 10s, 11s, 12s Sprockets
Performance Output
50A
Max Speed
45+ MPH
Pro Kit
Price Range
Premium
Motor Power
4000W
Installation Time
50 mins
Battery System
72V (84V)
Weather Protection
IP54
Smart Protection
Smart BMS + Fuse + Temperature
Frame Compatibility
1s Sprocket
Performance Output
60A
Max Speed
50+ MPH
Entry Kit
Price Range
Entry Level
Motor Power
2000W
Installation Time
30 mins
Battery System
52V (58.8V)
Weather Protection
IP66
Smart Protection
Basic BMS + Fuse
Frame Compatibility
7s, 8s, 9s, 10s, 11s, 12s Sprockets
Performance Output
40A
Max Speed
34-38 MPH
Premium Kit
Price Range
Mid-Range
Motor Power
3000W
Installation Time
30 mins
Battery System
60V (71.4V)
Weather Protection
IP66
Smart Protection
Smart BMS + Fuse + Temperature
Frame Compatibility
7s, 8s, 9s, 10s, 11s, 12s Sprockets
Performance Output
50A
Max Speed
45+ MPH
Hear from our customers
Our overall rating is 4.4 out of 5 stars from over 1421 reviews
Mike R.
Mountain Bike Instructor
Beast Mode for Mountain Trails
Been using this kit for 3 months on my MTB in Peak District. The 4000W power is insane - climbs like a goat! Installation took about an hour with the included tools. Battery life is solid - I get around 45km of hard trail riding. Quality build and waterproofing held up great in typical UK weather. Worth every penny for serious riders.
Sarah Jenkins
Long Distance Commuter
Daily commuter, 20 miles each way
Absolutely transformed my commute! Did 50 miles yesterday and still had juice left. The display is super clear even in bright sunlight. Installation was straightforward with the video guide. Love cruise control for long stretches.
Tom Wilson
Former Motorcycle Racer
Good Power, Some Quirks
Powerful kit but took some getting used to. The torque is no joke - start in low PAS levels! Battery charges pretty quick, about 4 hours. Only complaint is the throttle sensitivity needs some fine-tuning. Tech support was helpful though.
James B.
Wilderness Tour Guide
Winter Commuting Game Changer
Using this on my fat bike for winter commuting. Handles snow and mud like nothing else. The 72V system gives amazing power when needed. The battery is still performing great after 4 months in cold weather. Solid build quality.
Emma Thompson
Food Delivery Rider
Full-time Deliveroo courier
Perfect for my delivery work. The range is spot-on - I get about 50km per charge doing deliveries around the city. The walking mode is super helpful in tight spots. No issues in rain either.
David K.
DIY Enthusiast
Mixed Feelings
Power is impressive but installation wasn't as easy as advertised. Needed a bike shop's help. Performance is great once setup properly though. I wish the manual was more detailed.
Richard Mills
Trail Park Owner
Off-Road Monster
This thing rips on trails! The torque is unreal for climbing. Battery lasts longer than expected even with aggressive riding. The controller handles heat well even on long uphill sections. Well worth the investment for serious off-roading.
Lisa Chen
Adventure Tourism Manager
Tour company operator
Fast shipping, great packaging. Using it on my 27.5" MTB and it's perfect. The display shows everything I need and the cruise control is brilliant for long rides. Getting about 60km range on moderate settings.
Convert Any Bike into a Supercharged E-Bike! DIY 72V 4000W Hub Motor Kit
What's in the kit?
What's included in the individual kit?
In the individual kit, you get everything you need to DIY your bike into an e-bike.
A 4000W powerful motor wheel, 48V-72V 60Amp FOC sinewave smart controller, 48V-72V TFT color display, 72V 20AH Lithium battery pack, 72V 5A Fast Charger, Twist Throttle with the key Lock, e-Brake levers and a good package with foam to protect all parts be safe.
In addition we provide free sweet service accessories, installation tools and additional parts.
1. MTX 39 Double Wall Aluminum Alloy Strong Rim. Black Color
2. 4000w Brushless Direct Drive Rear Wheel, 6.8kgs weight.
3. Black Paint Spokes anti-rust 12G 2.6mm with copper Nipples.
4. Dropouts: 135-142mm. Two Motors: One is for a 7s threaded sprocket, and The other is for Cassete 8s/9s/10s/11s sprocket.
5. Fit Disc Brake.
6. 55+MPH max speed.
7. CE, ROHS certificates.
1. 84VV Full Charged Voltage
2. 5A Fast Charger is included.
3. LG Grade A cells
4. USB mobilephone Charging
5. ON/OFF Switch
6. Battery Indicator. Precent.
7. Triangle Black Plastic Case.
1. 48V-72V 50Amp FOC
2. Sinewave 12 mosfets Controller.
3. Waterproof, Glues Inside.
4. Quick Release Cable.
5. Over Heating Protection.
6. Easy to Install with Tape Ties.
1. Color Display Design.
2. Battery Power Indicator.
3. Running Speed, Average Speed, Max Speed.
4. Single Mileage, Total Mileage.
5. PAS Levers, Brake Signal, Throttle Signal.
6. Cruise Function, 6KM/H Walk Function, and so on.
Electric Brake Lever to cut off the power when you press it.
Easy installation、More sensitive 、more stable performance.
Allen Tool Set
Allen Tool Set
Crankset Remove Tool
Freewheel Remove Tool
Crankset Remove Tool
Wrench
Sweet Service Accessories
Brake sensor
Torque arm
ECMF
Frequently Asked Questions
What's the real-world range I can expect?
Typical range varies from 40-80km depending on your riding style. You'll get maximum range when cruising at moderate speeds with pedal assist. Aggressive riding at top speeds (80-90 km/h) will reduce range significantly. Factors like rider weight, terrain, and temperature all affect actual performance.
How long does installation really take?
While we advertise a 50-minute installation time, most experienced riders complete it in 1-2 hours. We provide comprehensive tools and step-by-step video guides. First-time installers may want to schedule 2-3 hours or seek professional help for optimal setup.
About battery lifespan and charging
Using premium LG/Samsung cells, expect 800+ charge cycles over a 3-year lifespan with proper care. A full charge takes 4 hours 35 minutes. The intelligent BMS prevents overcharging and monitors cell health. The battery detaches easily for indoor charging.
How fast can it really go?
The system is capable of 80-90 km/h on flat terrain. However, real-world speeds depend heavily on conditions, rider weight, and battery charge level. The 110Nm torque allows for impressive acceleration and hill-climbing ability. Remember: this kit is designed for off-road use only.
What about noise and reliability?
The brushless direct drive motor operates quietly compared to geared systems. Military-grade construction and waterproof design ensure durability. Most users report thousands of kilometers without issues when properly maintained.
Customization & Control Features
The 3.5" TFT display allows full customization of power delivery, speed limits, and pedal assist levels. Intelligent cruise control maintains steady speeds, while the 6km/h walk assist helps in tight spaces. The controller can be fine-tuned for your riding style.
Safety & Legal Considerations
This high-performance kit is designed for off-road use. We require torque arm installation and recommend professional setup for optimal safety. Users should be aware of local regulations regarding e-bike power limits and usage areas.
What maintenance is required?
Regular maintenance includes checking motor connections, ensuring battery contacts are clean, and inspecting the torque arm. The controller and battery systems are sealed and maintenance-free. We recommend periodic firmware updates for optimal performance.
Still no battery
Received wheel and kit promptly 6 days after ordered, great. 15 days later and no tracking from the batteries original destination, so have no idea where it is or even if it’s coming. Image being a 14 year old kid, waiting.waiting, with no clue
Loving the Kirbebike 72V 4000W kit so far! It was easy to install and the power is insane—hits 55mph no problem. Battery range is solid too, perfect for long rides or daily commutes.
Smooth Setup, Solid Performance
Install was easier than I expected. The power is solid — great for daily commuting and weekend rides. I'm really satisfied so far.
Great Upgrade for My E-Bike
I recently installed the Kirbe 72V-4000W High-Power E-Bike Kit, and I’m absolutely impressed with the performance! The upgrade was straightforward and everything was well packaged, with clear instructions that made the installation process smooth and easy.
The power output is fantastic – it really gives my bike a serious boost. The 72V battery provides a long-lasting charge, and the 4000W motor delivers incredible torque and speed, making uphill climbs and rough terrain feel like a breeze. I’ve been cruising at high speeds with minimal effort, and the acceleration is quick and responsive.
The build quality of the kit is top-notch, with solid components that feel durable and well-made. I've also noticed a huge improvement in the overall ride, and the kit seems to balance power and efficiency perfectly.
I’m really enjoying the ride and highly recommend this kit to anyone looking to upgrade their e-bike for more power and performance. Kirbe has definitely delivered on their promise of high-quality performance!
4000W Fat Tire E-bike Kit
AMAZING! This e bike kit is awesome and puts out so much power. Very fast shipping and highly reliable, highly recommend!
4000w fat bike kit review.
Very happy with this kit. Easy to install. This is really powerful so I'd advise anybody with no prior ebike experience to be weary riding this. However, if you do buy this, you won't be disappointed with how much speed and power the kit produces.
No charger
I recently received my 72v kit after they had to get the battery from china. Yet when it arrived there wasn’t any charger in the package. Waiting two days so far for a reply.
Still not in use to to my bike frame been that bit smaller struggling to get a bike at minute
10/10
Best customer service and are really kind, fast replies and easy going. Delivery time for the kit was relatively fast considering the size and weight. Very happy with it.