Step-Through Fat-Tire Electric Cargo Bike
HKM-447123 Electric Cargo Bike
The HKM-447123 is a city cargo bike built around a 48 V brushless rear hub motor and a removable 48 V 18 Ah lithium pack holding 864 Wh - well above the 500-672 Wh typical of commuter e-bikes. A reinforced rear rack carries up to 66 lb of panniers, crates, or shopping bags, while the 6061 aluminum step-through frame lets you mount and dismount with the rack fully loaded. Hydraulic disc brakes on 180 mm rotors, 20 x 4.0 in fat tires, a front suspension fork, and Eco / Standard / Sport ride modes make it a practical replacement for short car trips.
48 V Brushless Hub Motor48 V 18 Ah / 864 Wh Pack37.3 mph Top SpeedApprox. 50 mi Range20 x 4.0 in Fat TiresHydraulic Disc, 180 mm Rotors66 lb Rear Cargo Rack330 lb Total Payload
Motor
48 V Hub
Brushless rear hub, sine-wave controller
Battery
48 V 18 Ah
864 Wh removable lithium with BMS
Top Speed
37.3 mph
60 km/h under test conditions
Range
Approx. 50 mi
80 km mixed riding with pedal assist
Tires
20 x 4.0 in
Fat casing, pavement to packed dirt
Total Payload
330 lb
150 kg rider plus cargo; 66 lb rack limit
Overview
The HKM-447123 is designed around one question: can a bicycle replace the car for the errands you run inside your own city? The answer here is a reinforced rear rack rated at 66 lb (30 kg), a combined rider-and-cargo payload of 330 lb (150 kg), and a 6061 aircraft-grade aluminum frame with TIG-welded joints sized for those loads rather than for a spec sheet. The step-through geometry matters more than it sounds: with panniers strapped to the rack you cannot swing a leg over a high top tube, so the dropped down tube is a functional decision, not a styling one.
Power comes from a 48 V brushless rear hub motor driven by a sine-wave controller. The higher system voltage is what gives the bike its character off the line - torque arrives immediately at a traffic light instead of building slowly the way a 36 V system does, which makes merging into city traffic feel deliberate rather than rushed. Sine-wave modulation keeps the motor quiet and vibration-free across the rev range, and the motor holds pulling power on grades above 15 percent so a loaded rack does not turn every bridge approach into a slog.
Energy storage is a 48 V 18 Ah lithium-ion pack rated at 864 Wh. An integrated Battery Management System monitors cell temperature, voltage balance, and charge history, protecting against overcharge, over-discharge, and short circuit. Under mixed riding with pedal assist most riders see roughly 50 mi (80 km) per charge; Eco mode on flat pavement returns 45-55 mi, while heavy throttle use in Sport mode brings that down to 25-35 mi. The pack unlocks with a key and lifts out for indoor charging.
The rest of the build follows the same logic. Hydraulic disc brakes with 180 mm rotors front and rear shed heat on long descents and hold lever feel consistent in wet weather - important on a bike that may be carrying an extra 66 lb. The 20 x 4.0 in fat tires and front suspension fork absorb potholes, curbs, and broken asphalt. A heavy-duty double-leg kickstand keeps the bike upright and stable while you load it, and internal cable routing plus stainless steel fasteners keep road film out of the places that corrode first.
Key Features
48 V Brushless Rear Hub Motor
The motor is laced directly into the rear wheel, so there is no secondary chain or belt in the drive path and nothing extra to service. A sine-wave controller meters current smoothly, which keeps the drive quiet at every speed and prevents the jerky engagement that cheaper square-wave controllers produce from a standstill with a loaded rack.
48 V 18 Ah Lithium Pack (864 Wh)
At 864 Wh this pack carries roughly 30-70 percent more energy than the 500-672 Wh packs common on commuter e-bikes. It locks into the frame with a keyed mechanism and lifts out in seconds for charging at a desk or in an apartment. A smart BMS balances cells, limits charge current, and protects the pack from over-discharge and thermal stress.
Front Fork Suspension for City Surfaces
A suspension fork takes the sting out of expansion joints, sunken utility covers, and curb transitions. On a cargo bike this does double duty: it protects the rider and it keeps whatever is strapped to the rear rack from being launched off it when the front wheel drops into a pothole.
Hydraulic Disc Brakes with 180 mm Rotors
Sealed hydraulic lines actuate both calipers, and the large 180 mm rotors dissipate heat during repeated braking on long descents. Lever effort stays light and predictable in the wet, and there are no cables to stretch or corrode. Braking distance grows with cargo, so leave extra space when the rack is loaded.
Eco, Standard, and Sport Ride Modes
Three selectable modes let you trade range against response. Eco caps assist for the longest possible commute; Standard is the everyday setting; Sport releases the full output of the 48 V system for hills and faster traffic. A thumb throttle provides on-demand boost without pedaling, which is useful pulling away from an intersection under load.
20 x 4.0 in Fat Tires
The wide casing spreads the weight of rider and cargo across a large contact patch, adding grip on wet pavement, gravel shortcuts, and packed dirt paths. The extra air volume also acts as a second suspension stage at the rear wheel, where there is no fork to help.
LED Headlight and Brake-Activated Tail-Light
A high-lumen LED headlight runs off the main pack, so there are no separate cells to keep charged. The tail-light illuminates whenever either brake lever is pulled, and side reflectors round out visibility from every angle in traffic.
Reinforced Rear Cargo Rack, 66 lb Rated
The integrated rack is engineered for 66 lb (30 kg) and accepts standard pannier bags, cargo baskets, and bungee tie-downs. The extended platform gives you room to secure a load properly rather than balancing it. Combined with the 330 lb total payload rating, that covers a full week of groceries or a working set of tools.
Full Specifications
Model
HKM-447123 | Electric Cargo Bike
Frame Material
6061 aircraft-grade aluminum alloy, TIG-welded step-through geometry
Motor
48 V brushless rear hub motor with sine-wave controller
System Voltage
48 V DC
Battery
48 V 18 Ah lithium-ion (864 Wh), removable and lockable, smart BMS
Charger
48 V 3 A smart charger, 100-240 V input
Charging Time
6-7 hours from empty; roughly 3-4 hours for a 30 to 80 percent top-up
Battery Cycle Life
Several hundred charge cycles under BMS-managed charging
Top Speed
37.3 mph (60 km/h)
Range Per Charge
Approximately 50 mi (80 km); 45-55 mi in Eco, 25-35 mi with heavy throttle use
Climbing Grade
Sustained pulling power on grades above 15 percent
Ride Modes
Eco, Standard, and Sport, selectable from the LCD display
Cable Routing
Internal routing through the frame; stainless steel fasteners throughout
Brakes
Hydraulic disc brakes front and rear, 180 mm rotors
Suspension
Front fork suspension
Tires
20 x 4.0 in fat tires
Wheels
20 in rims with heavy-duty spokes
Saddle and Grips
Ergonomic saddle and grips tuned for an upright city riding posture
Display
LCD smart display: speed, battery level, ride mode, trip distance, odometer
Throttle
Thumb throttle for on-demand electric boost without pedaling
Lighting
LED headlight, brake-activated tail-light, side reflectors, powered by main battery
Total Payload
330 lb (150 kg) rider plus cargo; rear rack rated 66 lb (30 kg)
Bike Weight
Approximately 62 lb (28 kg)
Kickstand
Heavy-duty double-leg kickstand for stable parking under load
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 48 V x 18 Ah configuration yields 864 Wh of stored energy. Watt-hours are the honest way to compare packs between models, and 864 Wh sits comfortably above the 500-672 Wh found on most commuter e-bikes. That reserve is what allows a loaded cargo run in Standard mode without watching the battery gauge for the whole return leg.
Range depends on rider weight, cargo weight, terrain, assist level, tire pressure, wind, and ambient temperature. Under mixed riding with pedal assist in Eco mode most riders record 45-55 mi (72-88 km). Sport mode with heavy throttle use lands nearer 25-35 mi (40-56 km). Cold weather temporarily reduces available capacity; it returns when the pack warms.
Tip: Charge with the supplied 48 V 3 A smart charger only. A full 0 to 100 percent charge takes about 6-7 hours; a 30 to 80 percent top-up takes roughly 3-4 hours. If the bike will sit unused for more than a month, store the pack at 30-70 percent charge and top it up every 4-6 weeks.
The pack is fully removable and lockable, which suits apartment dwellers and office charging - and it lets you bring the battery indoors in cold weather while the bike stays locked outside. Charging in place through the frame-side port works equally well when the bike is parked in a garage.
Daily Use & Care
- Check tire pressure weekly. Run 15-20 psi on pavement for lower rolling resistance and 10-12 psi on gravel or packed dirt so the fat casing can flatten and grip.
- Inspect brake pad thickness monthly. Hydraulic pads wear quietly; replace them once the friction material drops below 1 mm, and sooner if you regularly ride loaded.
- Lubricate the chain every 100-150 mi (160-240 km), and always after riding through standing water or dust.
- Confirm the rear rack bolts and both axle nuts are torqued before the first ride of each week. Carrying cargo works fasteners loose faster than riding unloaded.
- Rinse road salt and grit off the frame, rims, and drivetrain after winter rides. Stainless hardware resists corrosion but the alloy around it does not.
- Plan on having the hydraulic brake system bled roughly every 12-18 months, depending on how hard and how often you ride.
- Charge indoors at room temperature and unplug once the charger indicator turns green rather than leaving it connected for days.
What's in the Box
- 1 x HKM-447123 electric cargo bike, largely pre-assembled
- 1 x 48 V 18 Ah removable lithium battery pack (864 Wh)
- 1 x 48 V 3 A smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and pedal spanner
- 1 x Pair of pedals
- 1 x Rear cargo rack (pre-installed)
- 1 x User manual and assembly guide
Frequently Asked Questions
What is the actual range I can expect on a single charge?+
Range depends on rider weight, cargo, terrain, assist level, tire pressure, wind, and temperature. Under mixed riding with pedal assist in Eco mode most riders achieve approximately 45-55 mi (72-88 km). In Sport mode with heavy throttle use, expect closer to 25-35 mi (40-56 km). The 864 Wh pack gives you a substantial reserve either way.
How long does it take to fully charge the battery?+
Using the included 48 V 3 A smart charger, a full charge from 0 to 100 percent takes approximately 6 to 7 hours. A partial charge from 30 to 80 percent takes about 3-4 hours. The BMS regulates the charge curve to protect cell health.
Is the battery removable for off-bike charging?+
Yes. The 48 V 18 Ah pack is fully removable and locks into the frame with a keyed mechanism. Charge it on the bike or carry it inside - convenient for apartments, office charging, and keeping the pack out of the cold during winter storage.
How much can the rear rack actually carry?+
The reinforced rear rack is rated for 66 lb (30 kg) and accepts standard panniers, cargo baskets, and bungee tie-downs. That sits inside the 330 lb (150 kg) total payload figure, which counts rider and cargo together. Distribute weight low and evenly, and secure it before riding.
What kind of terrain can this bike handle?+
The 20 x 4.0 in fat tires, front fork suspension, and 48 V motor cover paved roads, gravel paths, packed dirt trails, and moderate inclines. The wide contact patch grips well on wet pavement and loose surfaces. It is not built for technical off-road riding, but urban potholes, curbs, and uneven streets are well within its envelope.
Does this bike require a license or registration?+
Rules vary by jurisdiction. A top speed of 37.3 mph (60 km/h) exceeds the limits of the common three-class e-bike framework in many US states, which may place this vehicle in a moped or motor-driven cycle category. Check your state and local regulations on classification, helmets, and registration before riding on public roads.
How much assembly is needed out of the box?+
The bike ships largely assembled. Remaining steps are fitting the front wheel, aligning and bolting the handlebar, installing the pedals and saddle, and checking brake alignment and torque. Budget 30-45 minutes with the supplied tools, or have a bike shop complete the setup.
What is the recommended maintenance schedule?+
Check tire pressure weekly, inspect brake pads monthly, lubricate the chain every 100-150 mi (160-240 km), and keep all fasteners torqued to specification. The brushless hub motor is sealed and needs no internal service. Plan a hydraulic brake bleed roughly every 12-18 months.
Service & Policies
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24 Months Warranty Service
The product is covered by a 24-month warranty from the delivery date against manufacturing defects. Coverage includes parts and labor; normal-wear items are excluded.
CERoHSUN38.3 Battery864 Wh PackHydraulic BrakesStep-Through Frame66 lb Rear Rack
Why Choose the HKM-447123
A Cargo Bike That Loads Like One
A 66 lb rack, a 330 lb total payload, and a double-leg kickstand that holds the bike upright while you strap things down are the three details that separate a real cargo bike from a commuter with a rack bolted on. You can load it standing on the sidewalk without a second person steadying the frame.
Fat Tires and a Fork for Broken City Streets
Sunken utility covers, brick lanes, curb cuts, and gravel shortcuts are the surfaces a city bike actually meets. The 20 x 4.0 in tires and the front suspension fork absorb them so the load on the rack stays where you put it.
Throttle or Pedals, Your Choice
The thumb throttle gives on-demand boost with no pedaling, which is what you want when pulling away from a light with a loaded rack. Pedal assist in Eco stretches range on longer trips. Most riders use both within the same journey.
Sine-Wave Control, Quiet Delivery
The controller uses sine-wave modulation rather than square-wave switching, which means smooth torque and low motor noise at every RPM. On a bike used in residential streets at early hours, that quietness is a practical feature, not a specification.
Real Emissions Math
The electric drivetrain converts over 80 percent of stored energy into forward motion, compared with roughly 20-30 percent for an internal combustion engine. For the 5-20 mi (8-32 km) daily distances most urban trips fall into, substituting this bike for a car removes those tailpipe emissions entirely.
Built for Weather and Daily Parking
Internal cable routing keeps housings out of the spray, stainless steel fasteners resist road film, and hydraulic brake lines cannot corrode the way cables do. A bike that lives outside a workplace all day needs all three.
Controls & Indicators
Power Button
On the battery pack; hold to switch the system on and off
Mode Buttons
Up and down buttons on the display cycle through Eco, Standard, and Sport
Thumb Throttle
Right-hand thumb lever; proportional response, works without pedaling
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
Segmented charge indicator plus percentage readout on the LCD
Light Switch
Long-press the up button to toggle the LED headlight and tail-light
Trip Reset
Hold the set button to clear trip distance and average speed for a new journey
Pre-Ride Safety Checklist
- Set tire pressure for the surface: 15-20 psi for pavement, 10-12 psi for gravel or packed dirt.
- Squeeze both brake levers. They should firm up well before touching the grip; sponginess means air in the hydraulic line.
- Confirm the battery is seated and locked, and that the LCD shows the state of charge you expect.
- Check that the rear rack is bolted tight and any cargo is secured with straps or bungees before you set off.
- Spin both wheels and verify nothing rubs the pads and the rims run true.
- Verify axle nuts, stem bolts, and the seat clamp are torqued, and rock the bike with the front brake on to check for headset play.
- Test the thumb throttle at walking pace in a clear area before entering traffic, especially with a loaded rack.
- Switch on the headlight and tail-light for low-light riding, and wear a helmet rated for the speeds this bike reaches.
Quick Troubleshooting
The motor does not engage when I press the throttle.+
Confirm the display is on and shows charge, that the battery is locked into the frame, and that both brake levers are fully released - the brake cut-off sensors disable the motor while a lever is pulled. Note any error code shown on the LCD before contacting support.
Range has dropped compared with when the bike was new.+
Check tire pressure first; a soft fat tire on pavement is the most common cause. Then consider temperature, cargo weight, and whether you have been riding in Sport mode. A persistent year-round drop of more than 30 percent after many cycles suggests the pack is aging.
The brakes feel spongy at the lever.+
Sponginess in a hydraulic system means air in the line or a fluid leak. Stop riding and have the system bled and inspected. Do not continue on a loaded cargo bike with compromised brakes.
The bike pulls to one side when the rack is loaded.+
Weight on the rack is probably uneven side to side, or sitting too high and too far back. Redistribute the load low and centered over the rear axle, and check that both panniers carry a similar weight.
There is a rattle from the front end over bumps.+
Check that the front axle is properly seated and the quick-release or axle nuts are tight. If the noise persists, the suspension fork may need service - inspect the stanchions for scoring and have a shop look at the lowers.
The display shows an error code and the bike will not move.+
Power the system off, wait 30 seconds, and switch it back on. If the code returns, write down the exact code and what you were doing when it appeared, then contact support - codes map to specific faults in the controller, motor, throttle, or battery circuits.
Certifications & Standards
The HKM-447123 is produced in a facility operating under an ISO 9001 quality management system. The battery cells and the assembled pack carry the test documentation normally required for lithium-ion transport and sale.
- CE - European Conformity marking covering the electrical assembly.
- RoHS - Restriction of Hazardous Substances compliance for the electronics.
- UN38.3 - Battery transport safety testing, required for lithium-ion shipping by air, sea, and road.
- MSDS - Material Safety Data Sheet available for the battery pack on request.
- ISO 9001 - Quality management system certification held by the manufacturing facility.
Important Safety Notes
This is a high-output electric bicycle capable of 37.3 mph (60 km/h) and designed to carry cargo. Read the manual fully before the first ride and practice throttle control and loaded braking in an open, traffic-free area until the response feels predictable.
- Wear a helmet on every ride. At 37.3 mph many riders choose a certified motorcycle or downhill helmet rather than a standard bicycle helmet.
- Do not exceed the 330 lb (150 kg) total payload, or the 66 lb (30 kg) rear rack limit.
- Secure all cargo before riding. An unsecured load shifting mid-corner is a common cause of loss of control on cargo bikes.
- Check local law before riding on public roads or paths. A 37.3 mph top speed may place this vehicle outside standard e-bike classifications in your area.
- Bed in the brake pads with 10-15 progressive stops during the first few rides, and allow longer stopping distances whenever the rack is loaded.
- Do not ride through water deep enough to reach the hub motor or the battery compartment.
- Charge only with the supplied 48 V 3 A charger, indoors, at room temperature, on a non-flammable surface, and do not leave a charging pack unattended overnight.
- Do not open, puncture, or modify the battery pack. Damaged lithium cells can vent and ignite.
HKM-447123 · 48 V brushless rear hub motor with sine-wave controller · 48 V 18 Ah lithium (864 Wh), removable and lockable · 37.3 mph (60 km/h) top speed · approximately 50 mi (80 km) range · 20 x 4.0 in fat tires · hydraulic disc brakes with 180 mm rotors · front fork suspension · 6061 aluminum step-through frame · 66 lb (30 kg) rear rack · 330 lb (150 kg) total payload · approximately 62 lb (28 kg) bike weight. Specifications are provided for reference; actual performance varies with rider weight, cargo, terrain, tire pressure, temperature, and riding style. Range figures are measured under moderate pedal assist on level pavement. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations before riding on public roads.
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