Electric Bicycles >>
HKM-1325651 48 V 13 Ah Folding Electric Mountain Bike, 500 W Motor, 31 mph Top Speed, 7-Speed Shimano, 20 x 4.0 in Tires
HKM-1325651
500 W 31 mph Folding Electric Mountain Bike
The HKM-1325651 is folding electric mountain bike. A folding hinge and a mountain-bike fork on the same frame is a combination most folders leave out to save weight.
Key Features
8 details that make the HKM-1325651 a dependable ride.
500 W Brushless Hub Motor
A brushless rear hub delivers a quoted 55 N.m of torque at the wheel, with a 750 W short-duration peak available for standing starts and short ramps. There is no external gearbox in the drive path, so losses stay low and routine maintenance amounts to keeping the axle hardware torqued and the connectors clean. The drive is rated to hold a gradient of about 20 degrees with a solo rider.
48 V 13 Ah Pack
The pack uses 18650 lithium with smart BMS and sits in a lockable cradle so it can be lifted out with a key and charged indoors, or charged in place through the frame-side port. A full charge from empty takes about 4-5 hours. A smart battery management system watches cell balance, temperature and current draw, and cuts the pack out before any of the three reaches a damaging level.
Suspension: Coil-sprung Front Fork with Lockout
Coil-sprung front fork with lockout is fitted. The point of the setup is to keep the tyre loaded and in contact with the ground; a wheel that is skipping is a wheel that is neither driving nor steering. Set the preload for your weight before the first proper ride and re-check it after the first month of use.
Mechanical Disc Brakes
Mechanical disc brakes, front and rear from Tektro are fitted at both ends. Both levers carry motor cut-off switches, so the drive is disabled the instant either one is pulled. Cable-actuated calipers are simple to service at the roadside and the pads can be swapped with basic tools. Bed the pads in during the first few rides with ten to fifteen progressive stops from moderate speed to build an even transfer layer on the rotors.
7-Speed Shimano Drivetrain
The 7-Speed Shimano drivetrain gives a usable pedalling cadence from walking pace up to the top of the bike speed range. Indexed shifting means each click lands on a defined cog rather than being trimmed by feel, and the wide ratio spread is what allows a rider to contribute meaningfully on a climb instead of leaving the whole job to the motor.
20 x 4.0 in Cst Tires
CST 20 x 4.0 in casings on 20 in alloy rims spread the load across a large contact patch. Pressure is the main tuning control you have: firmer for tarmac and lower rolling resistance, softer for gravel, sand, wet grass and packed snow where the casing needs to deform and key into the surface.
LED Lighting and Backlit Display
An LED headlight and a brake-activated tail-light both run from the main pack, so there are no coin cells or separate USB lights to keep charged. The backlit display shows road speed, remaining charge, assist level, trip distance and total odometer, and switches between mph and km/h in the settings menu.
Rated for 300 lb (136 Kg)
The frame, wheels and brakes are specified together for a combined rider-and-cargo figure of 300 lb (136 kg). That rating covers the rider, clothing, any luggage and anything strapped to a rack. Staying inside it is what keeps spoke tension, rim trueness and braking distance where the design intended them to be.
Overview
Built for the ride ahead.
The HKM-1325651 is folding electric mountain bike. A folding hinge and a mountain-bike fork on the same frame is a combination most folders leave out to save weight. The folding joint is the part that defines this bike. A central hinge with a cam-locked clamp splits the main triangle, the stem folds down, and the pedals fold in, which reduces the parked footprint to something that fits behind a car seat or in a hall cupboard. Check the clamp tension every few weeks, because a hinge that is allowed to work loose is the one failure point a rigid frame does not have. Power comes from a 500 W brushless rear hub with a 750 W short-duration peak, fed by a 48 V 13 Ah pack holding 624 Wh of 18650 lithium with smart BMS. Peak torque at the wheel is quoted at 55 N.m, and the drive is rated to pull a gradient of roughly 20 degrees with a solo rider aboard. The 7-Speed Shimano drivetrain lets you add your own effort across the whole speed range rather than sitting on the throttle. Quoted range is 19-31 mi (31-50 km), and the spread is wide because the bike adapts to how it is ridden.
Light, Stiff Aluminum Frame
An aluminum frame keeps the HKM-1325651 light to lift yet stiff to ride.
Restraint is the hardest thing to build, and the easiest thing to feel. The finish is the kind you notice with your hands before your eyes. The HKM-1325651 pairs a 500 W brushless rear hub, 750 W peak, 48 V 13 Ah lithium-ion (624 Wh), 18650 lithium with smart BMS, a range of 19-31 mi (31-50 km), varies with terrain, rider weight, tyre pressure 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 19-31 mi (31-50 km) per charge.
The HKM-1325651 runs on a 500 W brushless rear hub, 750 W peak, 48 V 13 Ah lithium-ion (624 Wh), 18650 lithium with smart BMS, a range of 19-31 mi (31-50 km), varies with terrain, rider weight, tyre pressure and assist level, a top speed of 31 mph (50 km/h), engineered for dependable day-to-day performance.
Daily Use & Care
A short routine keeps the ride quiet and the range where it should be.
Set tyre pressure for the surface you plan to ride. Firmer on tarmac for lower rolling resistance, softer on gravel and snow so the 20 x 4.0 in casing can deform and grip.
Rinse the frame, rims and drivetrain with fresh water after riding on salted roads or wet gravel. Road film attacks fasteners and finishes if it is left in place.
Check axle hardware and stem bolts before the first ride of each week. Motor torque works fasteners loose faster than it does on a conventional bicycle.
Wipe and re-lubricate the chain every 100 to 150 mi, or after any ride through standing water or heavy dust.
Inspect pad thickness monthly and replace when the friction material is under 1 mm. Pads wear quietly right up to the point where they stop working.
Charge the 624 Wh pack indoors at room temperature and unplug once the indicator turns green rather than leaving it connected for days.
Keep the display cover and the charge-port cap closed whenever the machine 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-1325651 Folding Electric Mountain Bike
1 x HKM-1325651 folding electric mountain bike
1 x 48 V 13 Ah Removable Lithium Pack (624 Wh)
1 x 48 V 13 Ah removable lithium pack (624 Wh)
1 x Smart Charger with 100-240 V Input
1 x 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 LED Headlight (pre-installed)
1 x LED headlight (pre-installed)
1 x User Manual
1 x User manual
Why Choose the HKM-1325651
6 reasons it earns its place.
It Folds
A folding hinge and a mountain-bike fork on the same frame is a combination most folders leave out to save weight. The HKM-1325651 is specified as a whole rather than as a list of parts: the 624 Wh pack, the 500 W motor and the folding aluminum alloy with a central latch hinge frame were chosen to work together for multi-modal commuting where the last mile is ridden and the rest is driven, parked or taken on a train.
Suspension That Earns Its Weight
Coil-sprung front fork with lockout. Travel is not free; it adds weight, cost and one more thing to service. It is worth having here because the frame folds at the mid-point and the stem folds forward, which drops the whole bike into a shape that fits a car boot, a train luggage rack or the corner of a studio flat.
Two Ways to Make It Move
Twist the throttle for immediate drive from a standstill, or use the 7-Speed Shimano and pedal. Most owners end up mixing the two: throttle to clear a junction, gears and legs to hold a cruising speed, and full assist reserved for gradients and headwinds. Mixing the two is also what produces the range figures at the upper end of the quoted band.
Braking Specified for the Speed
Cable-actuated disc brakes from Tektro are fitted at both ends, with pads that can be replaced with basic tools. A 31 mph machine needs braking hardware chosen for that speed rather than carried over from a slower bike, and the motor cut-off switches in both levers mean the drive can never fight the brakes.
Running Costs Are the Quiet Advantage
A full charge of the 624 Wh pack costs a few cents of mains electricity and covers 19-31 mi. There is no fuel, no oil change and no emissions test, and the brushless drive produces no exhaust and very little noise, which matters on shared paths and in residential streets early in the morning.
Built to Be Left Outside and Used Again Tomorrow
Sealed connectors, a lockable battery cradle, an aluminum frame and disc braking that is unaffected by a wet rim are all choices that make sense for a machine that gets parked outdoors and ridden in whatever the weather is doing. Rinse road salt off after winter rides and the hardware will outlast the battery.
Every Component Chosen for Real-World Use
Every component of the HKM-1325651 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-1325651 pairs a 500 W brushless rear hub, 750 W peak, 48 V 13 Ah lithium-ion (624 Wh), 18650 lithium with smart BMS, a range of 19-31 mi (31-50 km), varies with terrain, rider weight, tyre pressure and assist level, so it is built for real-world rides rather than showroom specs.
Controls & Indicators
What each control on the HKM-1325651 does.
Power Button
On the battery cradle; hold to switch the system on and off
Assist Buttons
Up and down keys on the display step through five assist levels plus zero
Twist Throttle
Right-hand grip, proportional response, independent of the assist level
Speedometer
Live road speed in mph, switchable to km/h in the settings menu
Charge Gauge
Segmented state-of-charge bar with a percentage readout on the display
Light Switch
Long-press the up key to toggle the headlight and tail-light
Shifter
Right-hand indexed shifter for the 7-Speed Shimano drivetrain
Frequently Asked Questions
Quick answers about the HKM-1325651.
How much assembly is needed out of the box?
The HKM-1325651 ships roughly 85 percent assembled. What is left is fitting the front wheel, squaring and bolting the handlebar, installing the pedals and saddle, and checking brake alignment and axle torque. Budget 30 to 45 minutes with the supplied tools. If you are not comfortable setting brake and axle torque, have a bike shop do the final check.
What range should I actually plan for?
Plan on 19-31 mi (31-50 km). Throttle-only riding near 31 mph lands at the low end. Moderate pedal assist on rolling ground lands in the middle. Light assist on flat ground with correctly inflated tyres reaches the top figure. A heavy rider, a headwind, cold weather or soft tyres will each take a visible bite out of the number.
How long does a full charge take?
About 4-5 hours from empty with the supplied charger. Partial top-ups take proportionally less time, and there is no need to run the 624 Wh pack down before recharging. Charge indoors at room temperature on a non-flammable surface.
Is a licence or registration required?
Rules vary by state and by city. A 500 W nominal motor with a 31 mph ceiling generally falls inside the common three-class framework, but path access, helmet rules and minimum age are set locally. Confirm the rules where you ride before the first trip.
Can I ride it with the battery flat?
Yes. The 7-Speed Shimano drivetrain works independently of the motor. At about 60 lb (27 kg) the bike is heavy to pedal unassisted, so treat it as a way to get home rather than a normal riding mode.
Is the battery removable for indoor charging?
Yes. The 624 Wh pack unlocks with the supplied key and lifts out of its cradle, so it can be carried inside while the frame stays locked outdoors. It can also be charged in place through the frame-side port.
How small does it fold, and how long does it take?
The main hinge and the stem both release with cam-locked clamps, so a fold or an unfold takes well under a minute once you have done it a few times. Always check that both clamps are fully closed and that the safety catch has engaged before riding away.
What tyre pressure should I run?
For 20 x 4.0 in casings, run the upper part of the sidewall range on tarmac to cut rolling resistance, and drop toward the lower end for gravel, sand or packed snow so the casing can flatten and grip. Check pressure weekly; a soft tyre is the most common cause of a sudden drop in range.
Quick Troubleshooting
Common issues and what to check first.
The motor does nothing when I twist the throttle.
Check that the display is on and showing charge, that the pack is locked into its cradle, and that both brake levers are fully released, because the cut-off switches disable the drive whenever 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 tyre pressure first; a soft tyre on tarmac is by far the most common cause. Then consider temperature, since cold reduces available capacity temporarily. 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 or the lever pulls to the grip.
On a cable system this is usually pad wear or a stretched inner cable. Wind the barrel adjuster out to take up the slack, and if that runs out of adjustment, fit new pads and re-tension the cable. Do not continue riding a 31 mph machine on compromised brakes.
The chain skips under load.
Indexing is out of adjustment, or the chain and cassette are worn. Adjust the barrel adjuster a quarter turn at a time until each click lands cleanly. If the skip only happens in the smallest cogs, the cassette is worn and should be replaced together with the chain.
The front end rattles or clunks over bumps.
Confirm the axle is fully seated in the dropouts and that any quick-release lever is properly closed. If the noise persists, inspect the fork stanchions for scoring and check headset preload; a loose headset makes exactly this noise and will damage the bearings if it is left alone.
The display shows an error code and the machine will not move.
Switch 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. Error 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-1325651 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-1325651 pairs a 500 W brushless rear hub, 750 W peak, 48 V 13 Ah lithium-ion (624 Wh), 18650 lithium with smart BMS, a range of 19-31 mi (31-50 km), varies with terrain, rider weight, tyre pressure 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 tyre pressure and set it for the surface you are about to ride.
Squeeze both brake levers. They should firm up well before touching the grip, with no sponginess and no lever travel that keeps growing.
Confirm the pack is seated and locked and that the display shows the charge you expect.
Spin both wheels and check the rims run true with nothing rubbing a pad or the frame.
Check axle hardware and any quick-release levers, and rock the machine with the front brake applied to confirm the headset has no play.
Test the throttle at walking pace in a clear area before entering traffic or committing to a trail.
Switch on the headlight and tail-light if you will be riding near dusk, and wear a helmet rated for 31 mph.
Confirm nothing carried on a rack or in a bag can foul the wheels, the chain or the brake lines.
Service & Policies
Every HKM-1325651 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 31 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 31 mph. Do not exceed the 300 lb (136 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-1325651 - Folding 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.
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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.
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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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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
