Electric Bicycles >>
HKM-0637523 16 in Fat Tire Electric Mountain Bike, 750W Peak Motor, 48V 13Ah Battery, 28 mph Top Speed, Mechanical Disc Brakes
HKM-0637523
750 W 28 mph Fat Tire Electric Mountain Bike
The HKM-0637523 is built around the smallest wheel size we currently offer, and that choice does most of the design work. A 16 in wheel lowers standover height, shortens the reach to the ground, and lets the frame fold down to a footprint that fits inside most car trunks and apartment closets.
Key Features
8 details that make the HKM-0637523 a dependable ride.
500 W Brushless Rear Hub Motor (750 W Peak)
A 500 W brushless motor with a 750 W peak rating is laced into the rear wheel hub. There is no chain or belt between the motor and the ground, so drive losses stay low and maintenance is limited to keeping the axle nuts torqued. Peak output handles moderate hills with a solo rider and pulls away confidently from a stop at an intersection.
48 V 13 Ah Lithium Pack (624 Wh)
The pack sits inside the down tube behind a lockable cover and lifts out with a key for indoor charging. 624 Wh is enough for several days of short commutes between charges. A full recharge from empty takes about 4-6 hours on the supplied charger; partial top-ups take proportionally less time.
Dual Suspension Front and Rear
A front suspension fork and a rear coilover shock smooth out broken pavement, gravel shortcuts, and curb edges. The smaller 16 in wheel size transmits more road feel than a 20 in wheel, so the suspension travel matters more here than on larger platforms.
Mechanical Disc Brakes
Cable-actuated mechanical disc brakes at both wheels provide consistent stopping power in dry and wet conditions. Lever effort is higher than hydraulic brakes but the system is serviceable with basic tools. Power-off brake levers cut motor drive the instant either lever is pulled.
7-Speed Shimano Derailleur Drivetrain
A 7-Speed drivetrain with index shifter gives usable pedaling cadence from walking pace up to cruising speed. Combined with 5 pedal-assist levels, the gear range is wide enough for moderate hills and steady cruising on flat ground.
16 x 4.0 in All-Terrain Fat Tires
High-volume 4.0 in fat tires spread rider weight over a wide contact patch. They grip gravel, grass, and wet pavement where a narrower tire would skate around on the loose surface. They also absorb small vibration that the suspension travel does not cover.
Integrated Rear Rack with Brake Light and Turn Signal
A steel rear rack is bolted to the frame and wired into the main battery for a brake light and turn signals - useful in traffic and at dusk. The rack surface is sized for a backpack, a small crate, or panniers.
LED Headlight and Color LCD
A bright LED headlight runs off the main pack so there are no separate batteries to keep charged. A center-mounted color LCD reports speed, battery state of charge, assist level, odometer, and trip distance.
Overview
Built for the ride ahead.
The HKM-0637523 is built around the smallest wheel size we currently offer, and that choice does most of the design work. A 16 in wheel lowers standover height, shortens the reach to the ground, and lets the frame fold down to a footprint that fits inside most car trunks and apartment closets. The trade-off - less roll-over smoothness than a 20 in or 26 in wheel - is covered by full suspension at both ends and high-volume 4.0 in fat tires that absorb what the smaller wheel would otherwise transmit to the rider. Underneath the styling is a modern electric drivetrain. A 500 W brushless rear hub motor with a 750 W peak rating feeds power through a twist throttle and 5 pedal-assist levels, drawing from a 48 V 13 Ah lithium pack that holds roughly 624 Wh. A 7-speed Shimano drivetrain lets you add human power when you want to extend the range or climb steeper hills than the motor can handle on its own. Real-world range lands between 40 mi and 65 mi from a full charge depending on how you ride.
Engineered Around the Details That Matter
The HKM-0637523 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-0637523 pairs a 500 W brushless rear hub motor, 750 W peak, 48 V 13 Ah lithium-ion (624 Wh), removable and lockable, a range of 40-65 mi (64-105 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 40-65 mi (64-105 km) per charge.
The 48 V 13 Ah pack stores 624 Wh of energy. That is roughly in line with what most 500 W to 750 W commuter e-bikes ship with - enough for a work week of short commutes between charges, or a full weekend of mixed trail riding. Real-world range depends on how much you pedal, rider and cargo weight, tire pressure, and terrain. Throttle-only riding on flat pavement at moderate speed lands in the 35-45 mi band. Moderate pedal-assist on the same terrain regularly returns 50-60 mi. Aggressive pedaling at low assist on level ground has been measured up to 65 mi from a full charge. Cold weather below 40 F (4 C) temporarily reduces available capacity by 10-20 percent; it returns 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 bike. Run 15-20 psi on pavement for lower rolling resistance; drop to 10-12 psi for gravel and dirt so the tire can flatten and grip the surface.
Rinse the frame, rims, and drivetrain with fresh water after riding on salted roads or wet gravel. Road film attacks aluminum fasteners over time if left in place.
Check that both axle nuts and the stem bolts are torqued before the first ride of each week. Hub-motor torque works fasteners loose faster than on a conventional bicycle.
Wipe and re-lubricate the chain every 100-150 mi, or after any ride through standing water or dusty conditions.
Inspect brake pad thickness monthly. Mechanical pads give audible warning as they wear; replace when the friction material is under 1.5 mm.
Charge indoors at room temperature. Unplug the charger once the indicator turns green rather than leaving it 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-0637523 Electric Mountain Bike
1 x HKM-0637523 electric mountain bike
1 x 48 V 13 Ah Removable Lithium Battery Pack
1 x 48 V 13 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 Folding Pedals
1 x Pair of folding pedals
1 x Rear Rack (pre-installed)
1 x Rear rack (pre-installed)
1 x User Manual and Assembly Guide
1 x User manual and assembly guide
Why Choose the HKM-0637523
6 reasons it earns its place.
Compact
A 16 in wheel platform drops standover height so riders from about 4 ft 5 in can flat-foot the bike at a stop. The shorter wheelbase also makes the bike easier to store in an apartment closet, a car trunk, or under a workbench.
Full Suspension on A Small Platform
The smaller wheel transmits more road feel than a 20 in or 26 in wheel, so the front fork and rear shock do meaningful work here. Gravel shortcuts, brick-paved lanes, and curb edges all become rideable surfaces rather than places to slow down.
Two Ways to Ride
Twist the throttle for immediate motorcycle-style acceleration, or shift through the 7-Speed Shimano cassette and pedal. Most owners mix both - throttle to get moving from a stop, pedals to extend the range, and motor for hills.
Direct-Drive Simplicity
The motor lives in the rear hub with no mid-drive gearbox, belt, or extra chain to service. Fewer moving parts in the drive path means less to maintain and a notably quiet ride.
Short-Rider Friendly Geometry
The compact frame and 16 in wheels fit shorter riders (from about 4 ft 5 in) better than most adult e-bikes. It also fits in tighter storage spaces - a meaningful advantage for apartment dwellers and anyone who transports the bike in a car.
Built for Daily Use
Sealed electrical connectors, a covered and lockable battery compartment, and integrated rear lighting wired into the main battery all make sense for a bike that gets ridden to work every day and parked outside.
Every Component Chosen for Real-World Use
Every component of the HKM-0637523 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-0637523 pairs a 500 W brushless rear hub motor, 750 W peak, 48 V 13 Ah lithium-ion (624 Wh), removable and lockable, a range of 40-65 mi (64-105 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-0637523 does.
Power Button
Located 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 Throttle
Right-hand grip; proportional response, works independently of pedal-assist level
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
5-segment charge indicator plus percentage readout on the color LCD
Light Switch
Long-press the up button to toggle the LED headlight and integrated rear lighting
Turn Signal Switch
Left-hand switch toggles left and right rear turn signals
Shifter
Right-hand index shifter for the 7-Speed Shimano rear derailleur
Frequently Asked Questions
Quick answers about the HKM-0637523.
How much assembly is required out of the box?
The bike ships approximately 90 percent assembled. Remaining steps are straightening and bolting the handlebar, installing the pedals and saddle, and checking brake alignment. Budget 20-30 minutes with the supplied tools.
What is the actual range I should plan for?
Plan for 40-65 mi depending on how much you pedal. Throttle-only riding at higher speeds lands closer to 35-45 mi. Moderate pedal-assist on mixed terrain regularly returns 50-60 mi. Heavier riders, headwinds, hills, and low tire pressure all reduce range.
Is a license or registration required?
Rules vary by state and locality. A 750 W peak output motor and 28 mph top speed may place this vehicle outside the common three-class e-bike framework in some US jurisdictions. Check your state DMV and local ordinances before riding on public roads or bike paths.
Can it really climb a hill?
Up to approximately 15 percent grade with a solo rider on flat pavement. For steeper hills, drop to a lower gear and add pedal-assist. The combination of motor torque and your own pedaling is what gets up the steep stuff.
How long does the battery take to charge?
About 4-6 hours from fully empty with the supplied 2 A charger. Partial top-ups take proportionally less time.
Can I pedal it if the battery runs out?
Yes. The 7-Speed Shimano drivetrain works independently of the motor. The bike is compact at approximately 67 lb, so pedaling home unassisted is reasonable on flat ground.
Is the battery removable for indoor charging?
Yes. It unlocks with the supplied key and lifts out of the down tube. You can also charge it in place through the frame-side charge port.
What is the warranty?
The product is covered by a 24-month warranty from the delivery date against manufacturing defects. Coverage includes parts and labor on the motor, battery, controller, and display. Normal-wear items (tires, brake pads, chain) are excluded.
Quick Troubleshooting
Common issues and what to check first.
The motor does not engage when I twist the throttle.
Confirm the display is on and shows charge, the battery is locked into place, and both brake levers are fully released - 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 dropped noticeably compared with when it was new.
First check tire pressure; a soft tire on pavement is the most common cause. Then consider temperature - cold reduces available capacity temporarily. If range is down more than 30 percent year-round after many charge cycles, the pack may be approaching the end of its service life.
The brakes feel weak at the lever.
Mechanical disc brakes use a cable that stretches over time. Tighten the barrel adjuster at the lever a quarter turn at a time until lever effort feels firm. If the pads are worn down to the indicator line, replace them.
The chain skips under hard pedaling.
The derailleur indexing is likely out of adjustment, or the chain and cassette are worn. Adjust the barrel adjuster a quarter turn at a time to align the indexing. If the chain skips only in the smallest cogs, the cassette is worn and should be replaced along with the chain.
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 the conditions that produced it, then contact support - error codes map to specific faults in the controller, motor, or throttle 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-0637523 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-0637523 pairs a 500 W brushless rear hub motor, 750 W peak, 48 V 13 Ah lithium-ion (624 Wh), removable and lockable, a range of 40-65 mi (64-105 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.
Check tire pressure and set it for the terrain you plan to ride: 15-20 psi for pavement, 10-12 psi for gravel or dirt.
Squeeze both brake levers. They should firm up well before reaching the grip; any sponginess means the cable needs tensioning.
Confirm the battery is seated and locked, and that the display shows the expected state of charge.
Spin both wheels and check that the rims run true and nothing rubs the brake pads or the frame.
Verify the quick-release levers and axle nuts 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, rear brake light, and turn signals if you will be riding near dusk, and wear a helmet rated for the speeds this bike reaches.
Service & Policies
Every HKM-0637523 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 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-0637523 - Tire Electric Mountain 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.
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UPS
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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
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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
