HKM-849939
Electric Mountain Bike
A high-performance e-MTB engineered for riders who demand power, range, and reliability across rugged trails and urban streets alike. The HKM-849939 combines a 48V 1000W motor with a lightweight aluminum frame to deliver an uncompromising riding experience.
37+ mi
Range per charge
>60 km
31 mph
Top speed
50 km/h
1000 W
Motor power
48V system
52 ft-lb
Torque
60–70 Nm
Built for the trail. Tuned for the ride.
Every component of the HKM-849939 has been selected to balance lightweight agility with raw electric power, giving you confidence on climbs, descents, and everything in between.
48V 1000W Rear Hub Motor
Delivers immediate, smooth acceleration with a torque band of 44–52 ft-lb (60–70 Nm). The rear hub configuration ensures balanced weight distribution and low-maintenance operation compared to mid-drive alternatives. Ideal for both steep trail climbs and brisk street commutes.
High-Capacity Lithium Battery
Travel over 37 miles (>60 km) on a single charge, with a rapid recharge time of just over 3 hours. The advanced lithium-ion cell architecture provides consistent power delivery throughout the entire discharge cycle, so you experience minimal performance drop as the battery drains.
27.5-Inch Aluminum Alloy Frame
Forged from lightweight yet durable aluminum alloy, the frame strikes an optimal balance between stiffness and compliance. The 27.5-inch wheel size offers quick handling on twisty singletrack while maintaining the rollover capability needed for rocky terrain.
Hydraulic Disc Brake System
Experience confident, fade-resistant stopping power in all conditions—rain, mud, or dry dust. Hydraulic actuation provides a smoother lever feel and more precise modulation than mechanical disc brakes, giving you finer control on technical descents and during emergency stops.
Precision drivetrain. Seamless shifting.
A 27-speed gear system paired with the electric motor lets you dial in exactly the right cadence for any gradient or surface.
27-Speed Gear Set
The wide-ranging cassette and triple-chainring configuration provide 27 distinct gear ratios. On steep climbs exceeding 15% grade, drop into the lowest gears to maintain a comfortable cadence while the motor assists. On fast flat sections or descents, shift up to higher gears and let the bike carry speed efficiently. The external drivetrain design is straightforward to service and widely compatible with aftermarket components.
Speed Range: 18.6–31 mph (30–50 km/h)
Depending on terrain, rider weight, and assist level, the HKM-849939 reaches speeds between 18.6 and 31 mph. This range provides ample velocity for urban commuting—keeping pace with city traffic—while remaining controllable on technical singletrack. The motor's progressive power curve means acceleration is smooth rather than jerky, enhancing rider confidence.
Stability meets traction.
Wide tires and thoughtful geometry give you the grip and composure needed for unpredictable terrain.
27.5 × 2.4-Inch Tires
The generous 2.4-inch tire width provides a larger contact patch than standard mountain bike tires, translating to superior grip on loose gravel, wet roots, and packed dirt. The 27.5-inch diameter preserves nimble handling characteristics, allowing quick direction changes when navigating tight switchbacks. Lower tire pressures can be run for added comfort and traction without risking pinch flats, thanks to the increased air volume.
Engineered from the inside out.
A closer look at the technology that powers every ride on the HKM-849939.
Lithium-Ion Cell Architecture
Modern lithium-ion chemistry offers higher energy density than older lead-acid or nickel-based batteries. The pack's battery management system (BMS) continuously monitors voltage, temperature, and current to protect against overcharge, deep discharge, and thermal runaway—extending overall service life significantly.
Rapid 3.2-Hour Charging
A high-efficiency charger replenishes the battery in just over 3 hours—among the fastest in its class. This means you can top up during a lunch break or between errands and be ready for another extended ride without lengthy downtime.
Brushless DC Motor Technology
The rear hub motor uses a brushless DC (BLDC) design, which eliminates the friction and wear associated with brushed motors. This results in higher efficiency, quieter operation, and a longer operational lifespan with virtually no internal maintenance required.
Technical Specifications
All the details you need, presented clearly.
Model
HKM-849939
HKM-849939
Frame Material
Aluminum Alloy
Aluminum Alloy
Wheel Size
27.5 in (69.9 cm)
27.5 in (69.9 cm)
Motor Type
Brushless Rear Hub
Brushless Rear Hub
Battery
48V Lithium-Ion
48V Lithium-Ion
Range
>37 mi (>60 km)
>37 mi (>60 km)
Torque
44–52 ft-lb (60–70 Nm)
44–52 ft-lb (60–70 Nm)
Gears
27-Speed
27-Speed
Brake Type
Hydraulic Disc
Hydraulic Disc
Top Speed
31 mph (50 km/h)
31 mph (50 km/h)
Charge Time
~3.2 Hours
~3.2 Hours
Tire Size
27.5 × 2.4 in
27.5 × 2.4 in
One bike, endless possibilities.
The HKM-849939 adapts effortlessly to how and where you choose to ride.
Mountain Trail Riding
Tackle rocky ascents and root-laced descents with confidence. The high-torque motor flattens steep grades, while the hydraulic brakes and wide tires keep you in control on loose, unpredictable surfaces. The 27-speed drivetrain allows precise gear selection for sustained climbs and fast, flowy downhill sections.
Urban Commuting
Skip traffic and parking hassles. With a top speed of 31 mph, the HKM-849939 keeps pace with urban traffic flows. The long-range battery covers most round-trip commutes with ease, and the rapid 3.2-hour charge means you can top up at the office for the ride home. The durable aluminum frame withstands daily use on potholed streets.
Weekend Exploration
Point the bike toward the horizon and explore gravel roads, fire trails, and countryside lanes. The >37-mile range opens up routes that were previously out of reach for a casual afternoon ride. The comfortable geometry and vibration-damping wide tires reduce fatigue on longer journeys.
All-Weather Reliability
Rain or shine, the hydraulic disc brakes deliver consistent stopping performance. The sealed motor housing and weather-resistant electrical connections mean you can ride confidently through puddles and light rain without concern. The anodized aluminum frame resists corrosion far better than steel alternatives.
Frequently Asked Questions
Everything you need to know about the HKM-849939.
What is the real-world range of the HKM-849939?
Under typical riding conditions—mixed terrain, moderate assist level, and an average rider weight of 165–185 lbs (75–84 kg)—the HKM-849939 delivers over 37 miles (>60 km) per charge. Factors such as aggressive throttle use, steep inclines, headwinds, and colder temperatures can reduce range. Conversely, riding in lower assist modes on flat terrain can extend range beyond the stated figure. The lithium-ion battery's BMS ensures consistent voltage output throughout the discharge cycle, so you won't experience a sudden power drop-off near the end of the battery's capacity.
How does the hydraulic disc brake system compare to mechanical brakes?
Hydraulic disc brakes use fluid-filled lines to transmit force from the lever to the caliper, whereas mechanical brakes rely on a steel cable. This fundamental difference yields several advantages: hydraulic systems provide superior modulation—meaning you can precisely control braking force—and they self-adjust for pad wear, reducing maintenance frequency. In wet or muddy conditions, hydraulic brakes maintain consistent performance because the sealed fluid system is unaffected by contaminants that can cause cable friction in mechanical setups. The result is shorter stopping distances and greater rider confidence, especially on long descents where brake fade is a concern.
Is the HKM-849939 suitable for off-road mountain biking?
Absolutely. The HKM-849939 is purpose-built for off-road use. The 27.5 × 2.4-inch tires provide ample traction on loose and uneven surfaces, the 44–52 ft-lb of torque conquers steep technical climbs, and the hydraulic disc brakes offer reliable speed control on descents. The aluminum alloy frame is engineered to absorb trail vibrations while remaining stiff enough for precise handling. While it excels on singletrack and fire roads, riders should note that this is an electric-assist mountain bike—its 48V 1000W motor adds weight compared to non-electric MTBs, which is noticeable during highly technical maneuvers. For aggressive downhill or extreme enduro riding, dedicated non-electric downhill bikes may be preferable, but for the vast majority of trail riding scenarios, the HKM-849939 performs exceptionally well.
How long does the battery take to charge, and can I charge it partially?
A full charge takes approximately 3.2 hours using the included high-efficiency charger. The lithium-ion battery can be charged at any state of discharge without developing a "memory effect"—a common issue with older battery technologies. Partial charging is perfectly safe and does not degrade the battery's capacity. In fact, keeping the battery between 20% and 80% charge for daily use can extend its overall service life. The integrated BMS protects against overcharging, so you can leave the battery plugged in overnight without risk of damage.
What maintenance does the rear hub motor require?
The brushless DC rear hub motor is effectively maintenance-free for its designed lifespan. Unlike brushed motors, there are no carbon brushes to wear out and replace. The sealed bearing design keeps dust and moisture out, and the motor does not require lubrication or internal cleaning under normal use. The primary maintenance consideration is ensuring the electrical connectors remain clean and dry. Periodic inspection of the wiring harness for signs of abrasion is recommended, especially if riding in rough terrain. The external drivetrain (chain, cassette, derailleur) follows standard bicycle maintenance intervals—clean and lubricate the chain regularly, and check gear indexing as needed.
Purchase with Confidence
Every HKM-849939 is backed by comprehensive coverage, so you can focus on the ride ahead.
Free Shipping on All Orders
We cover standard shipping costs on every HKM-849939 order. Your bike arrives securely packaged and fully insured during transit at no additional charge.
180 Days Purchase Protection
Should a manufacturing defect arise within the first six months of ownership, we will repair or replace the affected component at no cost to you.
30 Days Money-Back Guarantee
If the HKM-849939 doesn't meet your expectations, return it within 30 days of delivery for a full refund. We make the process simple and hassle-free.
24 Months Warranty Service
Enjoy two full years of warranty coverage on the frame, motor, and battery. Our support team is ready to assist with any warranty claims quickly and professionally.
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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