Electric Bicycles >>
HKM-9818323 28 mph Electric Fat Tire Bike, 750W Rear Hub Motor (1000W Peak), 48V 15Ah 720Wh Battery, 7-Speed Shimano
HKM-9818323
750 W 28 mph Electric Fat Tire Bike
The HKM-9818323 is built for riders whose route is not all pavement. The 20 in wheel diameter keeps standover height low and the bike easy to handle at walking pace, while the 4.0 in casing width floats over the surfaces that stop a commuter tire: crushed gravel, beach sand, forest duff, and the frozen ruts left behind after a thaw-freeze cycle.
Key Features
8 details that make the HKM-9818323 a dependable ride.
750 W Brushless Rear Hub Motor
The motor is laced straight into the rear wheel, so there is nothing between the windings and the ground except the tire. Nominal output is 750 W with a 1000 W peak reserved for hill starts and acceleration, and rated torque is 80 N.m - enough to pull a 330 lb combined load up a 30 degree pitch without stalling.
20 x 4.0 in All-Terrain Fat Tires
Run at 15-20 psi the tires roll efficiently on pavement; drop them to 10-12 psi and the casing flattens into a long contact patch that grips sand, gravel, and light snow. The knobby tread pattern clears mud instead of packing it, and the casings are puncture resistant rather than tubeless-fussy.
48 V 15 Ah (720 Wh) Locking Down-Tube Pack
The pack drops into a cradle in the down tube and locks with a key, which keeps the weight low and centred where it does the least harm to handling. A second key is supplied. You can charge it on the bike through the frame-side port or carry it to a desk and charge it there.
Hydraulic Disc Brakes Front and Rear
Sealed hydraulic lines mean lever effort stays light and predictable even after a long descent has heated the rotors, and there is no cable to stretch or corrode in road film. Both levers carry power-off switches that cut motor drive the instant you begin to brake.
Lockable Suspension Fork
The coil fork has preload adjustment and a mechanical lockout. Leave it open for broken pavement, gravel, and trail, or lock it out on smooth tarmac so none of your pedalling energy disappears into fork travel. Roughly 80 mm of usable travel takes the sting out of expansion joints and pothole edges.
7-Speed Shimano Derailleur Drivetrain
A Shimano rear derailleur and index shifter work with a 52-tooth chainring to give a gear range that stays useful from a crawl up to the 28 mph top speed. The wide range is also what lets a heavier rider help the motor on a long climb instead of leaving it to overheat on its own.
Backlit LCD with Five Assist Levels
Speed, battery percentage, assist level, trip distance, and odometer are all on one backlit screen that stays legible in direct sun. The up and down buttons step through five pedal-assist levels plus zero assist, and a long press toggles the lights without leaving the main screen.
LED Headlight
The headlight runs from the main pack, so there are no coin cells or USB lamps to keep charged, and it throws a shaped beam rather than a round spot. An electric horn sits under the left grip and the tail-light brightens whenever either brake lever moves.
Overview
Built for the ride ahead.
The HKM-9818323 is built for riders whose route is not all pavement. The 20 in wheel diameter keeps standover height low and the bike easy to handle at walking pace, while the 4.0 in casing width floats over the surfaces that stop a commuter tire: crushed gravel, beach sand, forest duff, and the frozen ruts left behind after a thaw-freeze cycle. Power comes from a 750 W brushless rear hub motor rated at 1000 W peak. Because the motor drives the wheel directly there is no secondary chain or gearbox in the drive path, which keeps the system quiet and limits routine maintenance to keeping the axle nuts torqued. Peak output is what gets a loaded bike moving from a standstill on an uphill start. The 48 V 15 Ah pack stores 720 Wh, sits inside the down tube behind a locking cover, and lifts out with a key so it can be carried indoors.
Confident, Even Disc Brakes
Disc brakes give the HKM-9818323 a confident, even stop in the wet and the dry.
Engineered to be the thing you stop thinking about, because it simply works. Composed where it matters, light everywhere else — that is the whole idea.
Full Specifications
Measurements are shown in US customary units first, with metric equivalents in parentheses.
Battery, Range, and Charging
Up to 28-50 mi (45-80 km) per charge.
The 48 V 15 Ah pack stores 720 Wh of energy. Most mainstream commuter e-bikes ship with 400-600 Wh, so this pack sits at the upper end of that budget, and that headroom is what decides whether you finish the week on one charge or three. Real-world range depends on four things far more than anything else: how much you pedal, total rider and cargo weight, tire pressure, and terrain. Throttle-only riding on flat pavement lands in the 28-34 mi band. Moderate pedal-assist on the same ground regularly returns 40-45 mi, and low assist with steady pedalling has been measured at 50 mi. Temperatures below 40 F (4 C) temporarily reduce available capacity by 10-20 percent, and it comes back once the pack warms up.
Daily Use & Care
A short routine keeps the ride quiet and the range where it should be.
Tire pressure sets the character of the ride. Run 15-20 psi on pavement for lower rolling resistance and drop to 10-12 psi on sand, gravel, or snow so the casing can spread and grip.
Rinse the frame, rims, and drivetrain with fresh water after riding on salted roads or wet gravel, then dry the rotors and re-lubricate the chain.
Re-torque the axle nuts, stem bolts, and crank bolts before the first ride of each week. Motor torque works fasteners loose faster than on a conventional bicycle.
Wipe and re-lubricate the chain every 100-150 mi, and check the 7-Speed Shimano derailleur indexing whenever shifting starts to hesitate.
Inspect brake pad thickness monthly. Replace the pads once the friction material is under 1 mm - hydraulic pads wear quietly and give little warning.
Charge indoors at room temperature and unplug once the charger indicator turns green rather than leaving the pack connected for days.
Keep the display boot and the charge-port cover closed when the bike is parked outside so moisture stays out of the connectors.
Wipe the fork stanchions clean after every dusty or wet ride; grit on the stanchion is what destroys fork seals.
What’s in the Box
Everything needed to get riding, right out of the box.
1 x HKM-9818323 all-terrain Fat Tire Electric Bike
1 x HKM-9818323 all-terrain fat tire electric bike
1 x 48 V 15 Ah Removable Lithium Battery Pack
1 x 48 V 15 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 A Pedal Spanner
1 x Toolkit with hex wrenches and a pedal spanner
1 x Pair of Pedals
1 x Pair of pedals
1 x User Manual
1 x User manual
Why Choose the HKM-9818323
6 reasons it earns its place.
One Bike for Pavement and Trail
Fat tires plus a suspension fork plus 80 N.m of torque means the bike does not have to be routed around the gravel shortcut, the beach access road, or the muddy stretch of the rail trail. Most owners find they stop planning routes around the surface.
Throttle and Pedals
Twist the grip for immediate power away from a light, then shift through the Shimano cassette and pedal to stretch the pack. Riders who mix the two typically see 40-50 mi per charge instead of the 28-34 mi a throttle-only rider gets.
Battery You Can Take with You
A key-locked pack that lifts out in seconds is the difference between charging in a warm apartment and running an extension cord to a cold garage. It also means a bike left in a rack is far less attractive to walk away with.
Direct Drive
There is no mid-drive gearbox, no belt, and no secondary chain in the motor path. Fewer moving parts means less noise at cruising speed and a maintenance list that stops at tires, chain, brake pads, and fasteners.
Built to Ride Through the Cold Months
Sealed connectors, a covered charge port, and fat tires that work at low pressure on snow make this a bike that keeps working in January. Expect 10-20 percent less range below 40 F; the capacity returns once the pack warms up indoors.
Sized for A Wide Range of Riders
The 20 in wheel and sloping top tube drop standover height so riders from 5 ft 3 in to 6 ft 3 in can flat-foot the ground at a stop. That is a meaningful safety margin on a bike that reaches 28 mph.
750 W Motor, Clean Pull From a Stop
The 750W motor on the HKM-9818323 pulls cleanly from a stop and stays composed as the speed builds.
Built for the life actually being lived, not the one staged for a photo. The finish is the kind you notice with your hands before your eyes. The HKM-9818323 pairs a 750 W brushless rear hub motor, 1000 W peak, 48 V 15 Ah lithium-ion (720 Wh), removable and lockable, a range of 28-50 mi (45-80 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-9818323 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
Twist-Grip Throttle
Right-hand control with proportional response; works independently of the pedal-assist level
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
5-segment charge indicator plus a percentage readout on the display
Light Switch
Long-press the up button to toggle the headlight and the tail-light
Shifter
Right-hand index shifter for the 7-Speed Shimano derailleur
Frequently Asked Questions
Quick answers about the HKM-9818323.
How much assembly is required out of the box?
The bike arrives roughly 85 percent assembled. You fit the front wheel, straighten and bolt the handlebar, install the pedals and saddle, and check brake alignment. Budget 30-45 minutes with the supplied tools, and have a shop verify torque and bed the pads if you would rather not do it yourself.
What range should I actually plan for?
Plan on 28-34 mi if you ride throttle-only at higher speeds, and 40-50 mi if you pedal with moderate assist. Rider weight, headwind, hills, cold, and low tire pressure all pull those numbers down, so leave a margin on unfamiliar routes.
Is 28 mph legal where I ride?
That depends on your state and city. A 750 W nominal motor with a 28 mph throttle speed sits above the Class 2 limit in most of the three-class framework, which can place the bike in a moped or motor-driven cycle category. Check your state DMV and local trail rules before you ride on public paths.
How long does a full charge take?
About 5-6 hours from empty with the supplied 2 A charger. Partial top-ups take proportionally less; lithium packs do not need to be run flat before recharging and in fact last longer if they are not.
Can I ride it with the battery removed or flat?
Yes. The 7-Speed Shimano drivetrain is completely independent of the motor. The bike weighs about 68 lb, so unassisted pedalling is slow work, but it is entirely possible on flat ground and it gets you home.
Do the fat tires make it slow on pavement?
At 15-20 psi the rolling resistance penalty on tarmac is small and the motor easily absorbs it. Below 12 psi the tire is noticeably draggy on hard surfaces, which is exactly why you only drop the pressure when you leave the road.
What maintenance does the hub motor need?
Practically none. Keep the axle nuts torqued, rinse road salt off after winter rides, and avoid submerging the hub. There are no brushes to replace and no gear oil to change on a direct-drive-style hub.
Will it climb a steep hill with a heavy rider?
Rated climbing grade is about 30 degrees with a solo rider, and 80 N.m of torque does most of the work. On very long climbs help the motor by shifting down and pedalling; that keeps controller and battery temperatures in a healthy range.
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 shows charge, the battery is locked into place, and that both brake levers are fully released - the brake cut-off sensors disable the motor while a lever is pulled. If the display shows an error code, note it and contact support.
Range has dropped noticeably compared with when the bike was new.
Check tire pressure first; a soft tire on pavement is the most common cause. Then consider temperature, because cold temporarily reduces available capacity. If range is down more than 30 percent year-round after many charge cycles, the pack is approaching the end of its service life.
The brakes feel spongy at the lever.
Sponginess in a sealed hydraulic system usually means air in the line or a fluid leak, so the system needs bleeding and inspection. Stop riding until it is corrected; braking on a 28 mph vehicle is not a system to compromise on.
The chain skips or hesitates under hard pedaling.
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 the chain skips only in the smallest cogs, replace the cassette together with the chain.
The front fork rattles or clunks over bumps.
Check that the axle is fully seated in the dropouts and that the fork crown bolts are torqued. If the noise persists, inspect the stanchions for scoring and have the lowers serviced.
The display shows an error code and the vehicle 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 the conditions that produced it, 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.
330 lb (150 kg) Load Rated
Rated to 150 kg, the HKM-9818323 carries rider and cargo without strain or sag.
Designed so the only thing you steer is your own route. Considered in the hand, quiet in use, and calm at the end of the day. The HKM-9818323 pairs a 750 W brushless rear hub motor, 1000 W peak, 48 V 15 Ah lithium-ion (720 Wh), removable and lockable, a range of 28-50 mi (45-80 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: 15-20 psi for pavement, 10-12 psi for loose ground.
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 that nothing rubs the pads, the fender, or the frame.
Check the axle nuts, the headset, and the seat clamp for play by rocking the bike with the front brake held on.
Test the throttle at walking pace in a clear, traffic-free area before joining traffic.
Switch on the headlight and tail-light for dusk or night riding, and wear a helmet rated for the speed this vehicle reaches.
Service & Policies
Every HKM-9818323 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 750 W bike is rated at 28 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; a certified downhill or motorcycle helmet is wise at 28 mph. Do not exceed the 330 lb (150 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-9818323 - mph Electric Fat Tire 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.
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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.
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Return Eligibility
30-Day Window
Request a return within 30 days of delivery.
Original Condition
Unworn or unused, with tags and original packaging.
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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
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Delivery Process
Delivery Time Summary
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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.
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Modify orders, track shipments, or speed up delivery.
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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
