⚡ Model S2 — New Release
HKM-816019 High-Performance 48V 1500W Fat Tire Electric Bike
Engineered for riders who demand uncompromising power, extended range, and rugged versatility. The Model S2 combines a high-torque brushless hub motor, a removable high-capacity lithium-ion battery, and a robust steel frame to deliver an electrifying ride on city streets, mountain trails, and everything in between.
31 mph
Top Speed
50 km/h
19–37 mi
Range
31–60 km
1,500 W
Motor Power
Brushless Hub
36 Ah
Battery
48V Li-Ion
Precision-Engineered Brushless Hub Motor
1500 watts of relentless torque. Zero compromise on efficiency.
1,500 W Front Hub Motor
Delivers approximately 2.0 horsepower of peak output, propelling the bike to speeds exceeding 31 mph (50 km/h). The brushless design minimizes friction, maximizes energy conversion, and extends operational life far beyond conventional brushed alternatives.
Smooth Torque Delivery
The advanced sine-wave controller regulates power output seamlessly, eliminating jerky starts and providing predictable acceleration. Whether climbing steep inclines or cruising at speed, the motor adapts intelligently to rider input.
48V High-Voltage Architecture
Operating at 48 volts, the electrical system runs cooler under load compared to lower-voltage competitors. This translates to sustained performance during extended rides, reduced energy loss through heat, and greater overall system longevity.
IP65 Weather Resistance
The motor housing and all electrical connections are sealed against dust ingress and low-pressure water jets. Ride confidently through rain, puddles, and muddy trails without compromising the integrity of the drive system.
Removable 36 Ah Lithium-Ion Power Core
Industry-leading energy density. Rapid recharge. Complete freedom.
36 Ah
Total Capacity
Approx. 1,728 Wh of stored energy at 48 V
19–37 mi
Real-World Range
31–60 km per charge, depending on terrain, rider weight, and assist level
~3 hrs
Charge Time
From depleted to full in just over three hours with the included fast charger
The heart of the HKM-816019 is its removable 48V 36 Ah lithium-ion battery pack, featuring premium-grade 21700 lithium cells arranged in a meticulously engineered configuration. The removable design allows for convenient off-bike charging—simply unlock, slide out, and charge indoors at your desk or workbench. A smart Battery Management System continuously monitors individual cell voltage, temperature, and charge cycles, protecting against overcharge, over-discharge, and short circuits. The battery casing is constructed from flame-retardant ABS with an aluminum alloy internal frame for impact resistance and heat dissipation.
With a usable energy capacity of approximately 1,728 watt-hours, this battery outperforms many competitors in the fat-tire category by a significant margin. Riders can expect 19 to 37 miles (31 to 60 kilometers) of pedal-assisted range on a single charge, varying with terrain gradient, payload, wind conditions, and selected power-assist level. The integrated LED charge indicator on the battery pack provides at-a-glance status without needing to power on the display.
- Cell Type: Premium 21700 lithium-ion cylindrical cells
- Nominal Voltage: 48 V DC
- Rated Capacity: 36 Ah (approx. 1,728 Wh)
- BMS Protection: Overcharge / Over-discharge / Short-circuit / Temperature
- Charge Cycles: Rated for 800+ cycles at 80% capacity retention
- Removable: Yes — tool-free removal with key-lock mechanism
Lightweight Steel Frame with Fat-Tire Geometry
Purpose-built durability meets everyday ride comfort.
High-Tensile Steel Frame
Engineered from premium high-tensile steel, the frame balances lightweight agility with exceptional structural integrity. The triangulated geometry distributes stress evenly across weld points, reducing fatigue over thousands of miles of mixed-terrain riding.
20-Inch Fat Tires
The 20-inch wheel diameter, paired with wide-profile fat tires, provides a larger contact patch for superior grip on loose gravel, sand, snow, and wet pavement. The increased air volume acts as natural suspension, absorbing trail chatter and pothole impacts.
Optimized Rider Geometry
The frame's standover height and reach measurements have been refined to accommodate a wide range of adult riders. An upright yet slightly forward-leaning position reduces wind resistance while maintaining long-ride comfort and visibility in traffic.
Integrated Cable Routing
Brake lines and shift cables are routed internally through the frame, protecting them from snagging on trail-side obstacles and giving the bike a clean, streamlined profile. This also reduces maintenance frequency by shielding cables from UV exposure and debris.
Hydraulic Disc Brake System
Confidence-inspiring stopping power in all conditions.
Hydraulic
Brake Type
Dual-piston calipers with mineral-oil actuation
Disc
Rotor Design
Stainless steel rotors with heat-dissipation cutouts
All-Weather
Performance
Consistent bite in rain, mud, and dusty conditions
The HKM-816019 is equipped with a front and rear hydraulic disc brake system that delivers exceptional modulation and raw stopping force. Unlike mechanical cable-actuated brakes that suffer from stretch and friction losses, the sealed hydraulic system transmits lever pressure directly to the caliper pistons with minimal lag. Dual-piston calipers clamp the stainless steel rotors evenly from both sides, reducing pad wear and eliminating rotor warping under repeated heavy braking.
The oversized brake rotors feature precision-cut ventilation channels that accelerate heat dissipation during prolonged descents. This thermal management ensures that braking performance remains consistent even after repeated stops from top speed. The ergonomic brake levers are adjustable for reach, accommodating both gloved and bare-hand riding.
7-Speed Precision Gear System
Seamless shifting. Effortless adaptability.
7 Ratios for Every Scenario
The wide-ratio 7-speed cassette provides low gears for steep climbs and high gears for fast flat-ground cruising. Each gear change is crisp and precise, with a derailleur tuned for reliability across the entire cassette range.
Thumb Gear Shifter
The ergonomic thumb-operated shifter requires minimal movement to toggle through gears. Designed for quick, intuitive shifts without removing your hand from the grip, it enhances both safety and riding enjoyment on technical terrain.
The 7-speed drivetrain transforms the Model S2 into a genuinely versatile machine. On steep ascents, drop into the lower ratios to maintain a comfortable cadence while the motor assists. On open roads, shift up to higher gears and let the 1,500 W motor stretch its legs. The system works in harmony with the electric assist, allowing riders to fine-tune their effort level and maximize battery range by selecting the optimal gear for any given slope or surface condition.
Technical Specifications
Every detail, meticulously engineered.
- Model: HKM-816019 (Model S2)
- Motor Type: 48V 1,500 W brushless front hub motor
- Peak Power Output: Approx. 2.0 hp (1,500 W nominal)
- Top Speed: Exceeds 31 mph (50 km/h)
- Battery: 48V 36 Ah removable lithium-ion (approx. 1,728 Wh)
- Range: 19–37 mi (31–60 km) per charge
- Charge Time: Approximately 3+ hours (fast charger included)
- Frame Material: High-tensile steel
- Wheel Size: 20 in (approx. 50.8 cm) fat tire
- Brake System: Front & rear hydraulic disc brakes
- Gear System: 7-speed cassette with thumb shifter
- Controller: Sine-wave, 48V compatible
- Display: Backlit LCD with speed, battery level, odometer, and assist mode
- Pedal Assist Levels: Multiple selectable modes
- Throttle: Thumb throttle with variable power delivery
- Lighting: Integrated LED headlight and rear light
Frequently Asked Questions
Quick answers to common rider inquiries.
What is the actual top speed of this electric bike?
The HKM-816019 Model S2 is capable of reaching speeds exceeding 31 mph (50 km/h) under optimal conditions with a fully charged battery, on flat terrain, and with a rider weight of approximately 165 lb (75 kg). Actual top speed may vary based on rider weight, terrain gradient, wind resistance, tire pressure, and selected assist mode. For safety, always adhere to local speed regulations and wear appropriate protective gear.
How far can I travel on a single battery charge?
Real-world range typically falls between 19 and 37 miles (31 to 60 kilometers) per full charge. This variance depends on several factors: the selected pedal-assist level, rider weight, terrain steepness, ambient temperature, tire pressure, and riding style. Using maximum throttle-only operation will yield range at the lower end of the spectrum, while conservative pedal-assist usage on flat terrain can extend range toward the upper limit. The 36 Ah battery provides one of the largest capacity reserves in the fat-tire e-bike category.
Is the battery removable for off-bike charging?
Yes. The 48V 36 Ah lithium-ion battery pack is fully removable via a secure key-lock mechanism. Simply unlock, slide the battery out of its cradle, and charge it indoors using the included fast charger. This feature is particularly convenient for urban commuters who park outdoors or in shared spaces where power outlets may not be accessible near the bike. The battery weighs approximately 18 lb (8.2 kg) and includes an integrated carry handle for easy transport.
What type of terrain is this fat-tire bike suitable for?
The 20-inch fat tires and robust steel frame make the Model S2 exceptionally versatile. It performs admirably on paved city streets, gravel paths, hard-packed dirt trails, sandy beaches, and even light snow. The wide tire profile (typically 4.0 in or wider) creates a large contact patch that enhances stability and flotation on soft surfaces. The hydraulic disc brakes and 7-speed gearing further expand its capability across varied terrain types. While it is not a dedicated downhill mountain bike, it handles moderate off-road conditions with confidence.
How does the hydraulic disc brake system compare to mechanical brakes?
Hydraulic disc brakes offer several significant advantages over mechanical cable-actuated systems. They provide superior modulation, meaning you can precisely control braking force with subtle lever pressure. The sealed hydraulic system is self-adjusting for pad wear and eliminates cable stretch, resulting in consistent lever feel over time. Additionally, hydraulic systems require less maintenance and deliver more stopping power with less hand effort—a critical safety benefit when riding a heavier e-bike at higher speeds.
What is the weight capacity of the HKM-816019?
The high-tensile steel frame and reinforced components support a maximum payload of approximately 330 lb (150 kg), including the rider and any cargo. The frame's triangulated design and quality weldments ensure structural integrity under load. For optimal performance and longevity, we recommend distributing weight evenly and securing any cargo with appropriate racks or panniers designed for fat-tire e-bikes.
Purchase with Confidence
Every order is backed by our comprehensive customer protection program.
Free Shipping on All Orders
Complimentary standard shipping to any address within the contiguous United States. Your bike arrives carefully packaged and fully insured during transit.
180-Day Purchase Protection
Extended coverage against manufacturing defects for a full six months from the date of delivery. We stand firmly behind the quality of every component.
30-Day Money-Back Guarantee
Not completely satisfied? Return your bike within 30 days for a full refund. No questions asked. We make the return process simple and straightforward.
24-Month Warranty Service
Two full years of warranty coverage on the frame, motor, and battery. Our dedicated support team provides prompt assistance for any warranty-related concerns.
The HKM-816019 Model S2 redefines what a fat-tire electric bike can deliver—blending robust 1,500 W power, a massive 36 Ah battery, precision hydraulic braking, and a rugged steel chassis into one cohesive, adventure-ready machine. Whether you are carving through city traffic or exploring backcountry trails, the Model S2 is engineered to take you further, faster, and with greater confidence.
Nationwide Service Network & Support
With over 3,000 authorized service centers across the United States, we ensure comprehensive after-sales support for your vehicle, giving you complete peace of mind.
We understand that maintenance needs may arise. When you purchase from us, you gain access to our unparalleled service ecosystem designed for maximum convenience and reliability.
1. DIY Repair & Parts Replacement:
For minor repairs or part replacements that can be handled personally, we provide cost-price genuine parts during the warranty period. Each order is accompanied by clear, step-by-step video tutorials to guide you through the self-repair process seamlessly.
2. Professional Servicing:
For issues requiring expert attention, simply contact our support team. We will locate the nearest authorized service center based on your order and location details. You only need to bring your vehicle to the designated center. Once servicing is complete, we will notify you for pickup. All repairs are free during the warranty period; afterward, only cost-based fees apply.
Rest assured—wherever you are, our extensive partner network is ready to keep your ride running smoothly.
Lifetime Limited Powertrain Warranty & Wrap Program
For added long-term security, our Lifetime Limited Powertrain Warranty and Lifetime Wrap Program provide continued mechanical breakdown coverage for as long as you own your vehicle—with no term or mileage restrictions.
Every product on Hekomart.com is expertly curated from thousands, quality tested, and lifestyle approved. Elevate your everyday.
Express Delivery Priority - Where Speed Meets Satisfaction
At Hekomart.com, we understand the anticipation that comes with every online order. While most platforms rely on standard economy shipping, we prioritize your excitement by strategically selecting premium express carriers to accelerate deliveries. Our intelligent logistics system analyzes real-time data to optimize routes, partnering with globally-recognized couriers like DHL, FedEx, and UPS to ensure 30% faster doorstep arrivals* than industry averages.
Every package receives 24/7 tracking visibility and proactive delivery updates, transforming waiting time into confidence. For time-sensitive purchases, our "Expedited Service Guarantee" offers optional priority handling at no extra cost, because your satisfaction isn't just a goal – it's the core of our delivery DNA.
*Based on internal 2025 data comparing standard shipping durations across major platforms. Delivery times vary by destination and customs procedures.
Credit Card 180 Days Purchase Protection
The 180 Days Purchase Protection protects the buyer if an item purchased has not been shipped or if a shipped item is significantly not as described by the seller. The 180 Days Purchase Protection covers all purchases and payments made through our website. We accept Visa, Master Card, American Express, and Discover Card. If you don't receive the item that you ordered, or it shows up significantly different from its description, you may qualify for Purchase Protection, and we'll reimburse you for the full purchase price plus any original shipping costs, subject to terms and limitations. If you are charged for a transaction that you didn't make, let us know within 60 days, and we've got you covered.
30 Days Money-Back Guarantee
We are confident that our products are of great quality and even better value. However, if upon receiving and inspecting your item you decide that you want to return it, you will have 30 days as of the date of shipment arrival to return it for a refund minus the shipping cost. No restocking charges. Any additional fees associated with a purchase transaction will be deducted from the amount of the refund.
24-Month Extended Warranty Service
If you purchase products from our website, you have 24 months to request repairs or replacement if any products turns out to be faulty or are not as advertised. During the warranty period if any product is found to have a manufacturer defect, we will repair or replace the defective part(s). If a product cannot be repaired or replaced within a reasonable time, you can request a refund or price reduction. We are confident that our products are of great quality and even better value. However, if upon receiving and inspecting your item you decide that you want to return it, you will have 30 days as of the date of shipment arrival to return it for a refund minus the shipping cost.
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