Electric Bicycles >>
HKM-3750483 48 V 14 Ah 500 W Electric Bike, 20 mph Top Speed, 9-Speed Shimano, 27.5 x 2.25 in Tires, Hydraulic Disc Brakes
HKM-3750483
500 W 20 mph Electric Bike
A mid-drive motor sits at the bottom bracket and turns the chainring rather than the wheel. Because its output passes through the 9-Speed Shimano cassette, the motor can be geared down for a climb exactly the way your legs are - so it holds peak efficiency on a grade where a hub motor would be labouring at low rpm and shedding energy as heat.
Key Features
8 details that make the HKM-3750483 a dependable ride.
Bafang Mid-Drive Motor
The Bafang 500 W mid-drive motor sits at the bottom bracket and drives the chainring, so its output is multiplied by the 9-Speed Shimano cassette exactly like your own pedalling. Rated 500 W with 750 W available in short peaks and 80 N.m of torque, it climbs in a low gear without the heat build-up a hub motor suffers at low wheel speed. Centre-mounted mass also keeps the weight low and between the wheels, which is why the bike still steers like a bicycle.
48 V 14 Ah Samsung Lithium Pack (672 Wh)
A 48 V 14 Ah Samsung lithium-ion pack storing 672 Wh sits behind a lockable cover and lifts out with a key, so it can charge at a desk while the bike stays locked outside. A full charge from empty takes about 5-6 hours on the supplied 2 A charger, and the battery management system handles cell balancing, over-current, and low-temperature cut-off without any input from you.
Suspension Fork with Preload and Lockout
A hydraulic suspension fork with preload adjustment and a mechanical lockout takes the edge off broken pavement, kerb drops, and gravel. Unlock it for rough surfaces; lock it out on smooth tarmac so none of your pedalling energy disappears into fork movement. Combined with the air volume in the 27.5 x 2.25 in tires it covers most of what a commute or a fire road throws at you.
Hydraulic Disc Brakes
Sealed hydraulic lines actuate both callipers, so lever effort stays light and predictable even when the rotors are hot at the bottom of a long descent, and there is no cable to stretch or corrode. Both levers carry cut-off switches that drop motor drive the instant they move - worth having on a bike that reaches 20 mph. Bed the pads in with 10-15 progressive stops before riding at speed.
9-Speed Shimano Derailleur Drivetrain
A 9-Speed Shimano drivetrain gives usable cadence from walking pace to cruising speed. Because the motor drives through the same cassette, choosing the right gear directly changes how hard the motor has to work. The index shifter, chain, and cassette are standard bicycle parts, so a worn chain is a shop-shelf item rather than a proprietary order, and the gear range is what lets a heavier rider climb without leaning on the motor the entire way up.
27.5 x 2.25 in Trail Tread Tires
27.5 x 2.25 in tires with trail tread carry the bike. Run them at the low end of the pressure range and the casing flattens into a wide contact patch that finds grip on gravel, wet pavement, packed snow, and loose dirt; run them firm and rolling resistance drops for pavement mileage. The Kenda casing is a common size, so tubes and spare covers are easy to source.
LED Headlight and Brake-Activated Tail-Light
The headlight runs off the main pack, so there is no separate cell to keep charged, and the tail-light brightens whenever either brake lever moves. On a bike that is often ridden home after dark that combination is more useful than a brighter beam alone, because it tells the driver behind you what you are about to do.
Rear Rack Mounts and Cargo Capacity
Threaded bosses on the seat stays and dropouts accept a standard rear rack, panniers, or a child seat. Combined rider and cargo capacity is 280 lb (127 kg), which leaves real headroom for a loaded backpack, a week of groceries, or camping kit on a bike that already weighs 55 lb on its own.
Overview
Built for the ride ahead.
A mid-drive motor sits at the bottom bracket and turns the chainring rather than the wheel. Because its output passes through the 9-Speed Shimano cassette, the motor can be geared down for a climb exactly the way your legs are - so it holds peak efficiency on a grade where a hub motor would be labouring at low rpm and shedding energy as heat. Energy comes from a 48 V 14 Ah Samsung lithium-ion pack holding 672 Wh. The pack unlocks with a key and lifts out of the frame so it can be charged indoors while the bike stays where it is parked. The charger supplied is a 2 A unit that takes a fully flat pack back to full in about 5-6 hours; partial top-ups take proportionally less, and there is no need to run the pack down before plugging in. Range is a window, not a number. Throttle-only riding at or near the 20 mph top speed sits at the low end, around 25 mi. Moderate pedal-assist on mixed terrain returns roughly 35 mi.
Suspension Smooths the Small Stuff
Suspension smooths the small stuff so the ride on the HKM-3750483 stays quiet over broken pavement.
The measure of a tool is how little you notice it once the work begins. Built for the life actually being lived, not the one staged for a photo. The HKM-3750483 pairs a Bafang 500 W mid-drive, 750 W peak, 48 V 14 Ah Samsung lithium-ion (672 Wh), removable and lockable, a range of 25-45 mi (40-72 km), varies with terrain, rider weight, and assist level, 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 25-45 mi (40-72 km) per charge.
The 48 V 14 Ah pack stores 672 Wh. Most commuter e-bikes ship with 400-600 Wh, so this is comfortably above that budget - and energy on board is the single variable that decides whether a bike can do a 45 mi day without a mid-ride charge. Four variables move real-world range more than anything else: how much you pedal, the combined rider and cargo weight, tire pressure, and terrain. Throttle-only riding near 20 mph lands around 25 mi. Moderate pedal-assist on mixed ground regularly returns 35 mi. Light assist with steady pedalling on level pavement reaches 45 mi. Below 40 F the pack temporarily gives up 10-20 percent of usable capacity and recovers it once it warms.
Daily Use & Care
A short routine keeps the ride quiet and the range where it should be.
Tire pressure sets the character of the bike. Run 41-55 psi on pavement for lower rolling resistance; drop toward 35 psi on gravel, sand, or snow so the casing can flatten and grip.
Rinse the frame, rims, and drivetrain with fresh water after riding on salted roads or wet gravel. Road film attacks aluminium fasteners if it is left in place.
Check the axle nuts and stem bolts before the first ride of each week. 80 N.m of motor torque works fasteners loose faster than a conventional bicycle does.
Wipe and re-lubricate the chain every 100-150 mi, or after any ride through standing water or dust.
Inspect brake pad thickness monthly. Pads wear silently until they are gone; replace when the friction material is under 1 mm.
Charge indoors at room temperature and unplug once the indicator turns green rather than leaving the charger connected for days.
Keep the display and charge-port covers closed when the bike is parked outside so moisture stays out of the connectors.
What’s in the Box
Everything needed to get riding, right out of the box.
1 x HKM-3750483 Electric Mountain Bike
1 x HKM-3750483 electric mountain bike
1 x 48 V 14 Ah Removable Lithium Battery Pack
1 x 48 V 14 Ah removable lithium battery pack
1 x 2 A Smart Charger with 100-240 V Input
1 x 2 A smart charger with 100-240 V input
2 x Battery Keys
2 x Battery keys
1 x Toolkit with Hex Wrenches and Pedal Spanner
1 x Toolkit with hex wrenches and pedal spanner
1 x Pair of Pedals
1 x Pair of pedals
1 x LED Headlight (pre-installed)
1 x LED headlight (pre-installed)
1 x User Manual and Assembly Guide
1 x User manual and assembly guide
Why Choose the HKM-3750483
6 reasons it earns its place.
Torque Through the Gears
Because torque goes through the 9-Speed Shimano cassette rather than straight to the wheel, the 80 N.m the motor makes is multiplied in a low gear. That is why a mid-drive climbs better than a hub motor of the same rating.
Climbs Without Drama
Rated at 80 N.m with 750 W available in peaks, the drive pulls a solo rider up a grade of roughly 25 degrees. Shift down, keep pedalling lightly, and the motor stays inside its efficient band instead of stalling and cooking itself at the bottom of the hill.
Three Ways to Ride
Twist or thumb the throttle for immediate power, dial in one of five pedal-assist levels and let the motor top up your effort, or switch assist off entirely and ride the 9-Speed Shimano drivetrain as a bicycle. Most owners use all three on the same trip.
Few Moving Parts in the Drive Path
The motor turns the chainring you already pedal, so there is no second drive system to maintain and no gearbox whine.
Roughly A Cent A Mile
A full 672 Wh charge costs a few pence of household electricity and covers 25-45 mi. Replacing even two car trips a week with this bike pays back a meaningful share of the purchase over a year, before you count parking and servicing.
Made to Live Outside
Weather is designed for rather than avoided: sealed plugs, a lockable battery cover, and hydraulic lines that cannot stretch or corrode mean an unexpected downpour is an inconvenience, not a repair bill.
Light, Stiff Aluminum Frame
An aluminum frame keeps the HKM-3750483 light to lift yet stiff to ride.
Nothing here is for show; everything here is for the ride. The details you never name are the ones you end up trusting the most. The HKM-3750483 pairs a Bafang 500 W mid-drive, 750 W peak, 48 V 14 Ah Samsung lithium-ion (672 Wh), removable and lockable, a range of 25-45 mi (40-72 km), varies with terrain, rider weight, and assist level, so it is built for real-world rides rather than showroom specs.
Controls & Indicators
What each control on the HKM-3750483 does.
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 5 pedal-assist levels plus zero assist
Throttle
Right-hand thumb throttle, proportional response, works independently of assist level
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
Segment charge indicator plus percentage readout on the backlit LCD
Light Switch
Long-press the up button to toggle the LED headlight and tail-light
Shifter
Right-hand index shifter for the 9-Speed Shimano rear derailleur
Frequently Asked Questions
Quick answers about the HKM-3750483.
How much assembly is required out of the box?
The bike arrives roughly 85 percent assembled. What is left is fitting the front wheel, straightening and bolting the handlebar, installing the pedals and saddle, and checking brake alignment. Budget 30-45 minutes with the supplied tools, and have a bike shop check torque and bed the brakes in if you would rather not do it yourself.
What range should I actually plan for?
Plan for 25-45 mi. Throttle-only riding near the 20 mph top speed sits at the low end, around 25 mi. Moderate pedal-assist on mixed terrain returns about 35 mi. Light assist and steady pedalling on level ground reaches 45 mi. Headwinds, hills, a heavy load, soft tires, and cold weather all reduce the result.
How long does the battery take to charge?
About 5-6 hours from fully empty with the supplied 2 A charger. Partial top-ups take proportionally less time, and there is no benefit to running the pack down before recharging - lithium cells prefer shallow cycles.
Is a licence or registration required?
Rules vary by state and by city. A 500 W motor with 750 W peak output and a 20 mph top speed sits at or beyond the edge of the common three-class e-bike framework in many US jurisdictions, which can place a bike like this in a moped or motor-driven cycle category. Check your state DMV and local ordinances before riding on public roads or shared paths.
Can I still pedal it if the battery runs flat?
Yes. The 9-Speed Shimano drivetrain works entirely independently of the motor. At roughly 55 lb the bike is heavy for unassisted pedalling, so getting home is slow going, but on level ground it is straightforward.
Why choose a mid-drive over a hub motor?
A mid-drive puts its output through the 9-Speed Shimano cassette, so a low gear multiplies motor torque the same way it multiplies yours. On a sustained climb that keeps the motor spinning in its efficient range instead of labouring at low rpm. The trade-off is chain and cassette wear, which is why the drivetrain is a standard serviceable pattern.
Will the brakes cope with the speed and the weight?
Hydraulic disc brakes are the appropriate specification for a 55 lb bike carrying up to 280 lb at 20 mph. Bed the pads in over the first few rides with 10-15 progressive stops from moderate speed to build the friction layer on the rotors, and brake earlier than you would on an unloaded bicycle when the bike is loaded.
Is the battery removable for indoor charging?
Yes. It unlocks with the supplied key and lifts out of the frame. You can also charge it in place through the frame-side port.
Quick Troubleshooting
Common issues and what to check first.
The motor does not engage when I use the throttle.
Confirm the display is on and showing charge, that the battery is locked into place, and that both brake levers are fully released - the cut-off sensors disable motor drive while a lever is pulled. If the display shows an error code, note it before contacting support.
Range has dropped noticeably compared with when it was new.
Check tire pressure first; a soft tire on pavement is the most common cause by a wide margin. Then consider temperature, which temporarily reduces available capacity in the cold. If range is down more than 30 percent year-round after several hundred cycles, the pack is approaching the end of its service life.
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.
The chain skips under hard pedalling.
The derailleur indexing is out of adjustment, or the chain and cassette are worn. Turn the barrel adjuster a quarter turn at a time to bring the indexing back. If it skips only in the smallest sprockets, the cassette is worn and should be replaced together with the chain.
There is a knock or rattle from the front end over bumps.
Check that the fork quick-release or axle is fully tight and the wheel is seated in the dropouts. If the noise persists, inspect the stanchions for scoring and have the lowers serviced - a fork that has lost its damping will also feel harsh rather than plush.
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, note 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
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.
From Frame to Wheels
From the frame to the wheels, the HKM-3750483 is built for consistent, confident performance.
The specifications above show exactly what is under the surface, and the ride proves it every time. The HKM-3750483 pairs a Bafang 500 W mid-drive, 750 W peak, 48 V 14 Ah Samsung lithium-ion (672 Wh), removable and lockable, a range of 25-45 mi (40-72 km), varies with terrain, rider weight, and assist level, so it is built for real-world rides rather than showroom specs.
Pre-Ride Safety Checklist
Run through these before every ride.
Set tire pressure for the surface you plan to ride today, not for the ride you did last week.
Squeeze both brake levers. They should firm up well before touching the grip, with no sponginess that would indicate air in the hydraulic line.
Confirm the battery is seated and locked and that the display shows the state of charge you expect.
Spin both wheels and check that the rims run true and nothing rubs a pad or the frame.
Check that the axle nuts and quick-releases are tight and that the headset has no play when you rock the bike with the front brake applied.
Test the throttle at walking pace in a clear area before riding in traffic.
Switch on the headlight and tail-light if you will be out near dusk, and wear a helmet rated for the 20 mph this bike reaches.
Service & Policies
Every HKM-3750483 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 280 lb (127 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-3750483 - Ah W 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.
The protection plan is designed to provide practical help in real-world situations. Whether you encounter a manufacturing issue, a performance problem, or an unexpected accident, our team is ready to assist with clear, fair solutions.
What Is Covered
Manufacturing Defects
We replace items with material or workmanship flaws at no charge.
Performance Failures
Free repair or replacement if the product fails under normal use.
Accidental Damage
One-time courtesy replacement at a reduced price.
Zero Hidden Fees
All shipping costs for replacements and returns are covered.
How to File a Claim
How This Differs from the Warranty
The 180-day purchase protection includes accidental damage and performance failures that are typically not covered by a standard warranty. It provides an additional layer of support during the first six months after purchase, giving you greater confidence and peace of mind.
We want you to be completely satisfied with your purchase. If for any reason you are not fully happy, you may return your item within 30 days of delivery for a full refund. No lengthy forms, no unnecessary questions.
Our return policy is built on a simple principle: if the product is not right for you, we will make it right. We understand that online shopping involves trust, and we work hard to earn that trust with every order.
Return Eligibility
30-Day Window
Request a return within 30 days of delivery.
Original Condition
Unworn or unused, with tags and original packaging.
Proof of Purchase
A receipt or order number is required.
Fast Refund
Refund processed within 10 business days.
How to Start a Return
Returns & Exchanges Overview
Damages & Exchanges
Please inspect your order as soon as it arrives. If the item is defective, damaged, or incorrect, contact us immediately so we can evaluate the issue and make it right. For exchanges, the fastest option is to return the original item and place a new order for the replacement.
We believe in the quality of our products, and we want you to share that confidence. Every product is backed by a 24-month warranty covering all structural and functional components, including zippers, buckles, straps, and fabric integrity.
The warranty is designed to be simple and accessible. You only need your proof of purchase to begin a claim, and our team will assess the issue promptly. If a manufacturing issue arises, we will make it right.
What the Warranty Covers
Comprehensive Coverage
Every part warranted for two full years.
Free Repair or Replacement
Whichever is faster, at no cost to you.
Quick Turnaround
Claims assessed within 1 business day.
Transferable
Warranty follows the product, not the owner.
How to File a Warranty Claim
Every order ships free—no minimums, no hidden fees. We currently deliver across the United States and are actively working to expand to more countries. We partner with reliable U.S. courier services to ensure your order arrives safely and on time.
Our delivery process is designed for transparency. From the moment you place your order to the moment it reaches your door, you receive clear updates at every stage. We carefully inspect each product before dispatch, and we provide tracking information as soon as your order ships.
Our U.S. Shipping Partners
USPS
Official national carrier with nationwide coverage.
UPS
Fast and reliable ground and express shipping.
FedEx
Express delivery with real-time tracking.
DHL eCommerce
Efficient parcel delivery for e-commerce shipments.
Delivery Process
Delivery Time Summary
Cancellations & Taxes
You may cancel your order at any time before it ships. All product prices include applicable taxes, and there are no additional VAT or customs fees for orders delivered within the United States.
Whether you have a question, need help with an order, or just want some advice, our support team is available around the clock. We don't just respond to messages—we work with you to find real solutions that fit your needs.
Our support specialists are trained to handle a wide range of requests, from product recommendations to technical troubleshooting. No matter the question, you can expect a professional and friendly response.
How We Can Help
Product Guidance
Our experts help you choose the right product.
Order Assistance
Modify orders, track shipments, or speed up delivery.
Warranty & Returns
Start claims or returns quickly and easily.
Technical Troubleshooting
Step-by-step solutions for product issues.
Contact Information
24/7 Phone
+1 (209) 280-3200
support@hekomart.com
Address
3401 Dale Rd, Modesto, CA 95356
Support Hours
Available 24 hours a day, 7 days a week
