K9 Dual Battery High Carbon Steel Off-Road Retro Electric Assisted Bicycle
The K9 is a retro-inspired electric assisted bicycle that combines classic vintage styling with modern dual battery technology. Its straight beam design and high carbon steel frame deliver a sturdy, nostalgic riding experience while the 20×4.0 fat tires conquer snow, sand, gravel, and city streets with confidence.
Whether you prefer pure electric cruising, pedal-assisted efficiency, or traditional cycling, the K9 adapts to your riding style with three distinct modes.
Retro Straight Beam Design
The K9 features a classic straight beam frame design that captures the timeless aesthetic of vintage motorcycles and bicycles. Built from high carbon steel, the frame offers exceptional durability and stability, supporting riders up to 150 kilograms. Color customization is available to match your personal style.
Dual Battery System
Equipped with a 48V10A lithium battery system, the K9 delivers a pure electric range of 30-40 kilometers. The dual battery configuration provides extended riding capability, making it ideal for longer commutes and off-road adventures.
Powerful 500W Motor
The 500W brushless motor propels the K9 to a top speed of 55 km/hour, keeping pace with city traffic while delivering the torque needed for off-road climbs and challenging terrain.
All-Terrain Fat Tires
The 20×4.0 electric vehicle-specific fat tires provide superior traction and flotation. Deep tread patterns grip mud, gravel, and snow, while the wide contact patch ensures stability on sand and loose surfaces.
Three Riding Modes
| Mode | Description | Best For |
|---|---|---|
| Pure Electric | Throttle-only operation, no pedaling required | Quick commutes, effortless cruising |
| Electric Power Assistance | Pedal with motor assist | Extended range, balanced effort |
| Human Powered Cycling | Traditional pedaling | Exercise, battery conservation |
Premium Components
The K9 is built with reliable, name-brand components throughout:
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Drivetrain: Shimano TX50 Dial + ZT50 Rear Pull with 7-speed flywheel
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Chain: KMC electric vehicle-specific rust-proof chain
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Crankset: Aluminum alloy crank 48T
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Brakes: Front and rear special mechanical disc brakes for electric vehicles
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Controller: 9-tube 25A positive jet brushless
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Instrument: 5-speed display with USB charging, P65 waterproof
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Switch: Three-in-one horn headlight steering function
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Front Fork: Snow shoulder oil yellow shock absorber
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Pedals: Half aluminum alloy folding foot pedal
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Wiring: Integrated P65 waterproof main line
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Sensor: Integrated 24 magnetic speed sensor
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Lights: Waterproof joint 2-in-1 function headlight; three-in-one brake light function taillight
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Charger: Certified plug 54.6VDC head 2.5
Specifications Table
| Specification | Details |
|---|---|
| Model | K9 |
| Frame Material | High carbon steel |
| Design | Retro straight beam, classic style |
| Tire Size | 20 × 4.0 (electric vehicle specific) |
| Motor | 500W |
| Battery | 48V10A lithium battery |
| Range | 30/40 kilometers |
| Top Speed | 55 km/hour |
| Horizontal Handle | High carbon steel |
| Tooth Disc | Aluminum alloy crank 48T |
| Dial | Shimano TX50 |
| Rear Pull | Shimano ZT50 |
| Flywheel | Shimano 7-speed |
| Controller | 9-tube 25A positive jet brushless |
| Instrument | 5-speed with USB charging, P65 waterproof |
| Switch | Three-in-one horn headlight steering function |
| Brake | Special mechanical disc brake for front and rear electric vehicles |
| Chain | KMC electric vehicle specific rust-proof chain |
| Charger | Certified plug 54.6VDC head 2.5 |
| Front Fork | Snow shoulder oil yellow shock absorber |
| Main Line | Integrated P65 waterproof line |
| Booster | Integrated 24 magnetic speed sensor |
| Car Lights | Waterproof joint 2-in-1 function |
| Taillight | Three-in-one brake light function |
| Foot Pedal | Half aluminum alloy folding foot pedal |
| Riding Modes | 3 (Pure electric / Electric power assistance / Human powered) |
| Net Weight | 33 kg |
| Load Capacity | 150 kg |
| Gross Weight | 36 kg |
| Color | Supports customization |
| Packaging Size | 148CM × 30CM × 83CM |
| 20ft Container (28m³) | 70 units |
| 40ft HQ Container (68m³) | 170 units |
General Questions
Q: What is the K9 electric assisted bicycle?
A: The K9 is a retro-style electric assisted bicycle featuring a classic straight beam design, high carbon steel frame, dual battery system, and 20×4.0 fat tires. It offers three riding modes — pure electric, electric power assistance, and human powered cycling — making it suitable for commuting, off-road adventures, and leisure riding.
Q: What makes the K9 different from other electric bikes?
A: The K9 combines vintage retro styling with modern dual battery technology. Its high carbon steel frame, 20×4.0 fat tires, 500W motor, and Shimano 7-speed drivetrain deliver a unique blend of classic aesthetics and all-terrain performance. It also supports full color customization.
Q: Who is the K9 designed for?
A: The K9 is ideal for adults seeking a stylish, durable, and versatile electric bicycle for city commuting, beach cruising, snow riding, gravel trails, and off-road adventures. Its 150kg load capacity accommodates a wide range of riders.
Battery & Range
Q: What type of battery does the K9 use?
A: The K9 uses a 48V10A lithium battery system. The dual battery configuration provides extended range and reliability for longer rides.
Q: What is the riding range of the K9?
A: The K9 delivers a range of 30–40 kilometers per charge, depending on riding mode, terrain, rider weight, and weather conditions. Using electric power assistance mode extends the range compared to pure electric mode.
Q: How long does it take to charge the battery?
A: Charging time depends on the battery level and charger used. The K9 comes with a certified plug 54.6VDC head 2.5 charger. A full charge typically takes several hours. Contact us for detailed charging specifications.
Q: Can I ride the K9 when the battery is depleted?
A: Yes. The K9 offers a human powered cycling mode, so you can continue riding even when the battery is empty. This makes it a true hybrid bicycle.
Motor & Performance
Q: How powerful is the K9’s motor?
A: The K9 is equipped with a 500W brushless motor, delivering strong acceleration and climbing capability for both on-road and off-road riding.
Q: What is the top speed of the K9?
A: The K9 reaches a top speed of 55 km/hour, making it suitable for keeping pace with city traffic and covering distance efficiently.
Q: What is the controller specification?
A: The K9 uses a 9-tube 25A positive jet brushless controller, providing smooth and responsive power delivery.
Q: Does the K9 have a speed sensor?
A: Yes. The K9 features an integrated 24 magnetic speed sensor (booster) for accurate pedal-assist response.
Riding Modes
Q: What are the three riding modes?
A: The K9 offers three riding modes:
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Pure Electric – Throttle-only operation, no pedaling required. Ideal for quick commutes and effortless cruising.
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Electric Power Assistance – Pedal with motor assist. Balances effort and range for longer trips.
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Human Powered Cycling – Traditional pedaling with no motor assist. Great for exercise and battery conservation.
Q: How do I switch between riding modes?
A: Riding modes are controlled through the 5-speed instrument display with USB charging. The display is P65 waterproof and shows speed, battery level, and assist level.
Tires & Suspension
Q: What size tires does the K9 have?
A: The K9 features 20×4.0 electric vehicle-specific fat tires. These wide tires provide superior traction and flotation on snow, sand, mud, gravel, and rough terrain.
Q: What type of front fork does the K9 have?
A: The K9 is equipped with a snow shoulder oil yellow shock absorber front fork, designed to absorb bumps and improve comfort on uneven surfaces.
Brakes & Safety
Q: What type of brakes does the K9 have?
A: The K9 features special mechanical disc brakes on both the front and rear, providing reliable stopping power in all conditions.
Q: Does the K9 have lights?
A: Yes. The K9 includes:
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Headlight: Waterproof joint 2-in-1 function
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Taillight: Three-in-one brake light function
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Switch: Three-in-one horn headlight steering function
Q: Is the K9 waterproof?
A: The K9 features an integrated P65 waterproof main line and a P65 waterproof instrument display, making it resistant to rain and splashes. However, we recommend avoiding deep water submersion.
Frame & Build
Q: What is the frame material?
A: The K9 frame is constructed from high carbon steel, offering exceptional strength, durability, and stability. The horizontal handle is also high carbon steel.
Q: What is the load capacity?
A: The K9 supports a maximum load capacity of 150 kilograms, accommodating most adult riders plus cargo.
Q: What is the net weight of the K9?
A: The net weight is 33 kilograms. The gross weight (including packaging) is 36 kilograms.
Q: What components are used on the K9?
A: Key components include:
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Dial: Shimano TX50
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Rear Pull: Shimano ZT50
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Flywheel: Shimano 7-speed
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Chain: KMC electric vehicle-specific rust-proof chain
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Tooth Disc: Aluminum alloy crank 48T
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Foot Pedal: Half aluminum alloy folding foot pedal
Customization & Colors
Q: Can I customize the color of the K9?
A: Yes. The K9 supports color customization. Please contact us for available color options and lead times.
Q: Can I customize other specifications?
A: For custom specifications, bulk orders, or OEM/ODM requests, please contact our sales team directly to discuss your requirements.
Assembly & Maintenance
Q: Does the K9 come fully assembled?
A: The K9 ships partially assembled in its packaging (148CM × 30CM × 83CM). Some assembly is required. Detailed instructions are included, and most riders can complete assembly with basic tools.
Q: How do I maintain the K9?
A: Regular maintenance includes:
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Keeping tires properly inflated
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Checking brake pads and disc alignment
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Lubricating the KMC rust-proof chain
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Charging the battery regularly
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Storing in a dry place when not in use
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Inspecting the P65 waterproof connections periodically
Q: Is the chain rust-proof?
A: Yes. The K9 uses a KMC electric vehicle-specific rust-proof chain for long-lasting performance and low maintenance.
Shipping & Packaging
Q: What is the packaging size?
A: The K9 packaging size is 148CM × 30CM × 83CM.
Q: How many units fit in a container?
A:
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20ft container (28 cubic meters): 70 units
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40ft high container (68 cubic meters): 170 units
Q: Do you ship internationally?
A: Yes, we ship worldwide. Please contact us for shipping rates, lead times, and available destinations.
Warranty & Support
Q: Does the K9 come with a warranty?
A: Warranty terms vary by region and component. Please contact us directly for detailed warranty information covering the motor, battery, controller, and frame.
Q: What if I need replacement parts?
A: We stock replacement parts for all K9 components, including batteries, motors, controllers, brake pads, tires, and chains. Contact us for spare parts availability and pricing.
Q: How do I contact support?
A: For technical support, warranty claims, or general inquiries, please visit our contact page or email our customer service team. We’re happy to assist.
Ordering & Pricing
Q: How do I order the K9?
A: You can order directly through our website or contact our sales team for bulk orders, dealer inquiries, and OEM/ODM projects.
Q: Do you offer wholesale or dealer pricing?
A: Yes. We offer competitive wholesale and dealer pricing for bulk orders. Please contact us with your requirements for a customized quote.
Q: Can I request a sample before placing a bulk order?
A: Yes. Sample orders are available. Contact us to arrange a sample unit and discuss shipping details.
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