Electric Bicycles >>
HKM-0309843 14 in Folding Electric Bike, 500 W Rear Hub Motor, 48 V 15 Ah Lithium Pack, 20 mph Top Speed, Disc Brakes
HKM-0309843
500 W 20 mph Folding Electric Bike
The HKM-0309843 exists to solve one problem: getting an electric bike into places a full-size bike will not go. The frame folds at a single main hinge, the handlebar stem folds forward, and the pedals fold flat, which brings the package down to roughly 31 x 17 x 26 in.
Key Features
8 details that make the HKM-0309843 a dependable ride.
500 W Brushless Rear Hub Motor
A 500 W brushless motor sits in the rear hub and delivers 45 N.m of torque. Direct hub drive means no extra chain run, no clutch, and no noise beyond a faint whir. It reaches 20 mph on the flat and holds around 12-14 mph up a moderate city grade with a solo rider.
Single-Latch Main Frame Hinge
The main hinge uses a forged alloy clamp with a secondary safety catch, so the frame cannot open unless you deliberately release two separate mechanisms. Ten seconds and two levers take the bike from ridden to folded, with no tools involved.
Balanced Carry Point
Folded, the bike balances at the seat tube, which is exactly where your hand naturally lands. At 48 lb it is a genuine two-flights-of-stairs carry rather than a one-time heroic lift, and the folded package stands up on its own without leaning against a wall.
Quick-Release Telescoping Seatpost
A lever clamp drops or raises the seatpost across a 6 in range without tools, which matters when two people of different heights share the bike. Dropped fully, the post becomes the carry handle for the folded package.
Folding Alloy Pedals
Both pedals collapse flat against the crank arms, removing the widest part of the folded bike. The mechanism is a spring-loaded alloy hinge with a grippy platform surface, not a plastic clip that wears loose after a season.
Trunk
Folded dimensions of roughly 31 x 17 x 26 in clear the luggage rules on most regional rail services, fit a compact car trunk alongside a weekend bag, and roll into a standard elevator without blocking the doors.
Removable 48 V 15 Ah Lithium Pack
The 720 Wh pack unlocks with the supplied key and slides out of the seat tube, so you can charge it at an office desk and leave the bike locked outside. A full charge takes about 5-6 hours on the 3 A charger.
Front Fork and Rear Coil Suspension
A 55 mm coil fork up front and a coil shock in the folding rear triangle work together to keep 14 in wheels from transmitting every seam and pothole to your wrists and lower back.
Overview
Built for the ride ahead.
The HKM-0309843 exists to solve one problem: getting an electric bike into places a full-size bike will not go. The frame folds at a single main hinge, the handlebar stem folds forward, and the pedals fold flat, which brings the package down to roughly 31 x 17 x 26 in. That fits across the back seat of a compact car, into a sedan trunk beside a suitcase, or into a hallway closet. Folding does not mean underpowered. A 500 W brushless rear hub motor pulls from a 48 V 15 Ah pack storing 720 Wh, enough for 25-31 mi of pedal-assist riding and a 20 mph top speed. Torque is 45 N.m, which handles bridge ramps and parking-garage spirals without a run-up. Small wheels ride harshly on bad pavement, so this frame runs suspension at both ends: a coil-sprung front fork with 55 mm of travel and a rear coil shock in the folding tail.
Engineered Around the Details That Matter
The HKM-0309843 is engineered around the details that matter for everyday riding.
Every detail is chosen to make the ride smoother, safer, and more dependable, from the frame geometry to the final finish. The HKM-0309843 pairs a 500 W brushless rear hub motor, 48 V 15 Ah lithium-ion (720 Wh), removable through the seat tube, a range of 25-31 mi (40-50 km) on pedal assist; 16-20 mi (26-32 km) on throttle alone, so it is built for real-world rides rather than showroom specs.
Full Specifications
Measurements are shown in US customary units first, with metric equivalents in parentheses.
Battery, Range, and Charging
Up to 25-31 mi (40-50 km) on pedal assist; 16-20 mi (26-32 km) on throttle alone per charge.
The 48 V 15 Ah pack stores 720 Wh in 18650-format lithium cells behind a battery management system that monitors cell balance, temperature, and discharge current. It lives inside the seat tube rather than bolted to the outside of the frame, which keeps the folded package clean and the weight low and central. On mixed city riding in assist level 2, expect 25-31 mi (40-50 km). Using throttle alone with no pedalling cuts that to roughly 16-20 mi (26-32 km), because the motor is doing all of the work. Heavier riders, headwinds, repeated stop-start traffic, and temperatures below 40 F (4 C) all reduce the figure.
Daily Use & Care
A short routine keeps the ride quiet and the range where it should be.
Keep the tires at 35-40 psi. Small wheels lose pressure faster than large ones, and a soft 14 in tire is the fastest way to lose range and invite pinch flats.
Check that the main hinge clamp and stem clamp are fully closed with the safety catches engaged before every ride. Never ride a partially latched frame.
Wipe the chain and re-lube it every 100-150 mi, or after any wet ride. A single-speed chain is simple but still needs oil.
Adjust the mechanical disc brake cable tension when lever travel grows. A quarter turn of the barrel adjuster is usually enough.
Fold and unfold the bike a few times each month even if you are not riding, so the hinge pivots and pedal springs do not seize with grit.
Store the bike folded and indoors when possible. Leaving an aluminum folder outside through winter salt shortens the life of the hinge hardware.
Charge indoors at room temperature on a hard, non-flammable surface, and unplug once the indicator turns green.
What’s in the Box
Everything needed to get riding, right out of the box.
1 x HKM-0309843 Folding Electric Bike
1 x HKM-0309843 folding electric bike
1 x 48 V 15 Ah Removable Lithium Battery Pack
1 x 48 V 15 Ah removable lithium battery pack
1 x 3 A Smart Charger with 100-240 V Input
1 x 3 A smart charger with 100-240 V input
2 x Battery Lock Keys
2 x Battery lock keys
1 x Pair of Folding Alloy Pedals
1 x Pair of folding alloy pedals
1 x Toolkit with Hex Wrenches and A 15 Mm Pedal Spanner
1 x Toolkit with hex wrenches and a 15 mm pedal spanner
1 x Bell and Reflector Set
1 x Bell and reflector set
1 x User Manual and Folding Guide
1 x User manual and folding guide
Why Choose the HKM-0309843
6 reasons it earns its place.
Built Around the Fold
The hinge, stem, pedals, and seatpost were designed as one folding system. That is why the folded package stands upright on its own instead of sprawling apart the moment you let go of it.
Multimodal Commuting Actually Works
Ride to the station, fold, carry it onto the train, unfold at the far end. At 48 lb and 31 in folded it stays within the luggage limits that stop full-size bikes from boarding at peak times.
Lives Indoors Without Taking A Room
Folded it occupies about the floor area of a large suitcase, which means a hall closet, a cubicle corner, or the space under a desk. Storing it indoors also removes the theft risk entirely.
Silent in Shared Spaces
The brushless hub motor makes almost no noise, so riding through a quiet campus, an apartment courtyard, or an underground car park does not announce your arrival to everyone in it.
Suspension Where Folders Usually Skip It
Most bikes at this size run a rigid frame and fork to save weight and cost. Coil suspension at both ends is the single biggest comfort upgrade you can make to a 14 in wheel.
Sealed for Wet Commutes
The controller housing, display, and battery connections are sealed against rain and road spray, and the aluminum frame will not rust where the paint gets chipped by the fold.
Every Component Chosen for Real-World Use
Every component of the HKM-0309843 is chosen for real-world use.
It is built to be ridden regularly, cleaned easily, and kept in top condition with routine care. The HKM-0309843 pairs a 500 W brushless rear hub motor, 48 V 15 Ah lithium-ion (720 Wh), removable through the seat tube, a range of 25-31 mi (40-50 km) on pedal assist; 16-20 mi (26-32 km) on throttle alone, so it is built for real-world rides rather than showroom specs.
Controls & Indicators
What each control on the HKM-0309843 does.
Power Button
Hold the display power button for two seconds to wake or shut down the system
Mode Buttons
Up and down buttons cycle assist levels 1 through 3 and open the settings menu
Thumb Throttle
Left-hand thumb lever gives motor power without pedalling, up to the selected mode ceiling
Speedometer
Live speed shown in mph, switchable to km/h in the display menu
Battery Gauge
Five-segment charge bar plus a percentage readout on the LCD
Light Switch
Hold the up button to toggle the LED headlight, tail-light, and display backlight
Bell
Thumb bell on the left grip for shared paths and pedestrian crossings
Frequently Asked Questions
Quick answers about the HKM-0309843.
How small does it actually fold, and how long does it take?
Folded it measures roughly 31 x 17 x 26 in (79 x 43 x 66 cm). The sequence is pedals flat, seatpost down, stem forward, main hinge open - about ten seconds once you have done it a few times, with no tools required.
Does it have gears?
No derailleur and no gear cassette. It runs a single-speed chain with a freewheel, and you change effort by selecting one of three electric assist levels on the display. That keeps the folded package narrow and removes the most common source of folding-bike maintenance.
Can I pedal it if the battery runs out?
Yes. Unlike a throttle-only scooter, this is a pedal bike with a motor added. With the assist off it rides as a 48 lb single-speed - heavier than a normal bike, but entirely rideable home on the flat.
Will it fit in my car trunk?
A folded footprint of 31 x 17 in fits the trunk of most sedans and every hatchback and wagon we have tested it against. Measure the narrowest point of your trunk opening rather than the trunk floor, since the opening is usually the limiting dimension.
How far will it really go on one charge?
25-31 mi (40-50 km) using assist level 2 and pedalling normally. On pure throttle with no pedalling, plan for 16-20 mi. Cold weather, hills, a heavier rider, and constant stop-start traffic all pull the number down.
Is the suspension real or cosmetic?
Both ends carry actual coil springs. The fork has 55 mm of travel and the rear triangle carries a coil shock. On 14 in wheels this makes a large difference over expansion joints and broken asphalt, which is where small wheels normally punish you.
What is the difference between the three ride modes?
Mode 1 caps assist for maximum range and is the gentlest for new riders. Mode 2 is the balanced commuting setting. Mode 3 unlocks full 500 W output and the 20 mph top speed. You change modes with the buttons on the display while riding.
How much assembly is needed?
Very little - the bike ships folded and about 95 percent built. Unfold it, fit the pedals if they are packed separately, set the saddle height, check the brake and hinge adjustment, and charge the battery. Fifteen to twenty minutes is typical.
Quick Troubleshooting
Common issues and what to check first.
The motor does not engage when I pedal or use the throttle.
Confirm the display is on and an assist level above zero is selected, then check that both brake levers are fully released - the cut-off switches disable the motor while a lever is pulled. Finally, check the battery is locked in fully; a partially seated pack loses contact.
The frame feels like it flexes or clicks at the hinge.
Stop riding and inspect the hinge. The clamp tension is adjustable with the supplied hex key - tighten the adjuster nut a quarter turn at a time until the lever needs firm pressure to close. A hinge that closes with no resistance is too loose.
Range is much lower than the stated figures.
Check tire pressure first, since a soft 14 in tire can cost 20 percent of your range. Then consider assist level and throttle use: mode 3 and throttle-only riding both consume far more energy than mode 2 with pedalling. Cold weather also reduces available capacity temporarily.
The brakes rub or feel weak.
Mechanical disc cables stretch during the first few rides. Turn the barrel adjuster at the lever outward a quarter turn at a time until the pads bite earlier. If a rotor rubs constantly, loosen the two caliper bolts, squeeze the lever, and re-tighten to re-centre the caliper.
The pedals will not fold flat.
Grit in the spring mechanism is the usual cause. Rinse the hinge, dry it, and work a drop of light oil into the pivot while opening and closing the pedal several times.
The display shows an error code and the bike will not run.
Power the display off, wait 30 seconds, and switch it back on. If the code returns, note it exactly and contact support - codes correspond to specific faults in the controller, the hub motor, the throttle, or the brake cut-off circuit.
Certifications & Standards
Documented and tested for sale.
CE
European Conformity (CE) marking where applicable for the safety and electrical assembly.
ISO 9001
Quality management system held by the manufacturing facility.
Compliance Docs
Safety and compliance documentation included with every unit on request.
Tested
Each unit is inspected and function-tested before it leaves the warehouse.
Pre-Ride Safety Checklist
Run through these before every ride.
Confirm the main frame hinge and the stem hinge are both fully latched with their safety catches engaged. This is the single most important check on any folding bike.
Check tire pressure and inflate to 35-40 psi. Small wheels need more frequent topping up than 26 in or 700c wheels.
Squeeze both brake levers and confirm the pads bite well before the lever reaches the grip, and that the motor cut-off kills power when either lever is pulled.
Verify the seatpost clamp is closed and the post is not above its maximum insertion line.
Check the battery is locked in place and the display shows the state of charge you expect for your trip.
Spin both wheels to confirm the rims run true and the disc rotors are not rubbing the pads.
Test the throttle and assist at walking pace in a clear area before entering traffic.
Wear a helmet and use the lights in low visibility, whether or not local law requires them.
Service & Policies
Every HKM-0309843 is backed by coverage designed to protect your investment.
Free Shipping on All Orders
Every order ships free. Handling Time: 0-1 business days (Monday to Friday). Transit Time: 2-5 business days (Monday to Friday). A tracking number is emailed as soon as the parcel leaves our warehouse.
180 Days Purchase Protection
Your purchase is protected for 180 days from the delivery date against manufacturing defects and damage in transit. If something arrives wrong, we make it right.
30 Days Money-Back Guarantee
Not completely satisfied? Request a return within 30 days of delivery for a full refund. We keep the process simple and hassle-free.
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.
Important Safety Notes
Read before the first ride.
This 500 W bike is rated at 20 mph. Read the manual first and practise throttle and braking in an open, traffic-free area. Leave extra room for braking, since stopping distance grows fast with speed and load. Wear a helmet every ride. Do not exceed the 265 lb (120 kg) load limit, including rider, cargo, and rack load. Confirm local law before riding on public roads. Bed the brakes in with 10-15 progressive stops over the first rides. Never ride through water deep enough to reach the motor or battery. Charge only with the supplied charger, indoors and attended. Never open, puncture, or modify the pack. Slow down substantially on gravel, wet surfaces, and steep descents.
HKM-0309843 - Folding Electric Bike. Specifications are for reference; actual performance varies with rider, terrain, tire pressure, and temperature. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations before riding on public roads.
Every product we offer includes a 180-day purchase protection plan at no additional cost. This coverage extends beyond a standard warranty, reflecting our confidence in product quality and our ongoing commitment to your satisfaction.
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Every part warranted for two full years.
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support@hekomart.com
Address
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