Electric Bicycles >>
HKM-0834131 48 V 13 Ah Electric Mountain Bike, 500 W Motor, 25 mph Top Speed, 21-Speed Shimano Drivetrain, 27.5 x 2.1 in Tires
HKM-0834131
500 W 25 mph Electric Mountain Bike
It is worth reading the specification of the HKM-0834131 from the chassis outward rather than from the motor in. Underneath is a 6061 aluminum alloy hardtail mountain geometry rated to 330 lb, on 27.5 in wheels with 27.5 x 2.1 in tires, stopped by mechanical disc brakes and suspended by front suspension fork with lockout.
Key Features
8 details that make the HKM-0834131 a dependable ride.
500 W Brushless Rear Hub Motor
Rated 500 W continuous with 750 W available for starts and short climbs, this motor produces about 60 N.m. Sealed bearings and a weather-resistant housing keep grit and spray out of the windings, and the controller limits current to protect the motor when it is working hard at low wheel speed.
48 V 13 Ah Lithium Pack (624 Wh)
The pack is built from matched lithium cells behind a battery management system that guards against overcharge, deep discharge, short circuit, and excess temperature while balancing cells on every charge. A full charge takes 5-6 hours.
Preload-Adjustable Fork with Lockout
The coil fork offers roughly 80 mm of travel with a preload collar so heavier riders can firm up the spring rate. A crown-mounted lockout lever closes the damper for climbing and road sections, then releases in a second when the surface turns rough. Locked out, the bike pedals like a rigid commuter; open, it takes the sting out of rock gardens and gravel.
Mechanical Disc Brakes at Both Ends
Mechanical disc brakes, front and rear, 160 mm rotors. Braking is the system that has to scale with power and weight, and on a 55 lb bike travelling at 25 mph that is not a place to economise. Both levers carry a cut-off switch that removes motor drive the instant either is pulled.
21-Speed Shimano Derailleur Drivetrain (3 x 7)
The 21-speed shimano drivetrain gives a usable spread of ratios so you can contribute on a climb, hold a comfortable cadence at cruising speed, and ride home under leg power if the pack runs down. Indexed shifting is adjustable at the barrel adjuster without tools.
27.5 x 2.1 in Tires
Semi-knobby cross-country tread on sealed-bearing hubs. Pressure changes the character of the bike more than any other adjustment: lower for grip and float on loose ground, higher for lower rolling resistance on pavement. The recommended range is printed on the sidewall.
6061 Aluminum Alloy Hardtail Mountain Geometry
Welds are dressed and the frame is rated for a combined rider and cargo load of 330 lb (150 kg). Cable routing is tidied along the tubes so nothing snags, and the mounting points for the battery, controller, and accessories are integrated rather than clamped on.
Trail-Ready Cockpit and Mounting Points
A riser bar, ergonomic lock-on grips, and a forward-set stem give the upright but committed position that suits mixed trail riding. Bottle bosses on the down tube and rack mounts at the rear dropouts mean the bike accepts a cage, a light rack, or a frame bag without adapters, so it can double as a fair-weather commuter during the week.
Overview
Built for the ride ahead.
It is worth reading the specification of the HKM-0834131 from the chassis outward rather than from the motor in. Underneath is a 6061 aluminum alloy hardtail mountain geometry rated to 330 lb, on 27.5 in wheels with 27.5 x 2.1 in tires, stopped by mechanical disc brakes and suspended by front suspension fork with lockout. Those parts decide how the bike behaves; the 500 W drive and the 624 Wh pack decide how far and how fast it goes. The HKM-0834131 is built as a mountain bike first and an electric bike second. The hydroformed 6061 aluminum frame uses classic hardtail geometry - a real front triangle, a rigid rear end, and bottle bosses - so it handles the way a trail bike should. Adding the motor and pack takes it to roughly 55 lb, which is light enough that you can lift it onto a car rack without help. The drive system is brushless rear hub motor, rated 500 W continuous with 750 W available in short bursts and roughly 60 N.m of torque.
48 V Supply, Ready for Long Errands
A 48V supply keeps the HKM-0834131 ready for the long errand, not only the short hop.
Restraint is the hardest thing to build, and the easiest thing to feel. Considered in the hand, quiet in use, and calm at the end of the day. The HKM-0834131 pairs a 500 W (750 W peak) brushless rear hub motor, 48 V 13 Ah lithium-ion (624 Wh), a range of 25-40 mi (40-64 km), depending on assist level and terrain, 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 25-40 mi (40-64 km) per charge.
The 48 V 13 Ah pack stores about 624 Wh. Range is set by that figure divided by how much energy the bike uses per mile, and consumption swings widely with assist level, rider weight, tire pressure, and gradient. That is why the quoted band is 25-40 mi (40-64 km) rather than a single number. A full charge takes 5-6 hours from empty on the supplied smart charger, which tapers current as the pack fills and cuts off automatically. Partial charges do no harm to lithium cells - in fact, keeping the pack between roughly 20 and 90 percent for daily use extends its service life compared with routinely running it flat and filling it to 100 percent.
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 more than any other adjustment. Check it before every few rides; 27.5 x 2.1 in tires lose pressure faster than they look like they should, and a soft tire costs range as well as handling.
Keep the chain clean and lightly lubricated. Wipe the outside of the links with a rag, apply a drop of lubricant to each roller, then wipe the excess off - lubricant left on the outside of the chain simply collects grit.
Check brake pad thickness every month or so. Mechanical Disc Brakes should be replaced well before the friction material reaches the backing plate, and squealing under light braking usually means contamination rather than wear.
Retorque the axle nuts, stem bolts, and handlebar clamp after the first 30 mi and then every couple of months. Electric bikes transmit more load into fasteners than an unpowered bicycle does.
Rinse mud off with a low-pressure hose or a bucket and sponge. Never point a pressure washer at hub bearings, the motor, the display, or the battery connector; forcing water past a seal is how electrical faults start.
Charge the pack indoors at room temperature where you can see it, and unplug it once the charger indicates a full charge. Do not leave it connected for days at a time.
Check spoke tension by squeezing pairs of spokes together every few weeks. A loose spoke on a 27.5 in wheel carrying 330 lb of load will let the rim go out of true quickly.
What’s in the Box
Everything needed to get riding, right out of the box.
1 x HKM-0834131 Electric Mountain Bike
1 x HKM-0834131 electric mountain bike
1 x 48 V 13 Ah Lithium Battery Pack with Two Keys
1 x 48 V 13 Ah lithium battery pack with two keys
1 x Smart Charger with Regional Plug
1 x smart charger with regional plug
1 x Front Wheel with Axle Hardware
1 x front wheel with axle hardware
1 x Handlebar and Stem Assembly with pre-routed Cables
1 x handlebar and stem assembly with pre-routed cables
1 x Pedal Set
1 x pedal set
1 x Tool Kit with Hex Keys
1 x tool kit with hex keys
1 x Illustrated Assembly and Owner Manual with Torque Figures
1 x illustrated assembly and owner manual with torque figures
Why Choose the HKM-0834131
6 reasons it earns its place.
27.5 in Hardtail Electric Mountain Bike
Everything on this bike is chosen around one job. The 500 W motor, the 624 Wh pack, and the 6061 aluminum alloy hardtail mountain geometry chassis are matched to each other rather than assembled from whatever was on the shelf, and that is what you feel in the first mile.
A Mountain Bike That Still Rides Like One
Plenty of electric bikes are heavy cruisers with knobby tires. This one keeps mountain-bike weight, mountain-bike geometry, and a full 21-Speed Shimano gear range, so the motor is an addition rather than a replacement for pedalling. Turn the assist off and it is still a bike you would ride.
Two Ways to Ride
Use the assistance to flatten a headwind or a hill, or turn it down and ride under your own power with the motor idle. The 21-speed shimano drivetrain means the bike still works as a bicycle when the pack is empty.
Serviceable with Standard Bike-Shop Parts
Shimano derailleur, standard 100 mm front hub, 27.5 in rims, threaded bottom bracket, and cable-actuated disc brakes are all parts any bike shop stocks. Nothing on the chassis is a proprietary electric-only component, which keeps long-term running costs close to those of a conventional mountain bike.
Lower Cost and Quieter Than Driving
A full charge costs a few cents of electricity and covers 25-40 mi. There is no fuel, no oil change, and no exhaust, and the bike is quiet enough to hold a conversation alongside.
Built for Daily Use
Sealed connectors, a weather-resistant display, and shielded cable runs mean the bike copes with being ridden in the wet and left outside a shop. Parts that wear are standard sizes you can source anywhere.
Every Component Chosen for Real-World Use
Every component of the HKM-0834131 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-0834131 pairs a 500 W (750 W peak) brushless rear hub motor, 48 V 13 Ah lithium-ion (624 Wh), a range of 25-40 mi (40-64 km), depending on assist level and terrain, so it is built for real-world rides rather than showroom specs.
Controls & Indicators
What each control on the HKM-0834131 does.
Power Button
On the battery pack; hold it to switch the system on or off. The display wakes with it and shows the current charge level.
Mode Buttons
Up and down step through the assist levels; holding the down button engages walk assist, which moves the bike at a slow pace while you push it.
Throttle
Twist throttle on the right grip with progressive response.
Speedometer
Live speed on the display in mph or km/h, switchable in the settings menu along with wheel size and units.
Battery Gauge
A five-segment gauge on the display, with a voltage readout available in the settings menu for a more precise figure.
Light Switch
Holding the up button switches the headlight, tail light, and display backlight on and off together.
Shifter
Indexed shifter on the right grip controlling the 21-speed shimano drivetrain. Ease off the pedals as you shift under motor power.
Frequently Asked Questions
Quick answers about the HKM-0834131.
How much assembly is required out of the box?
The bike arrives roughly 85 percent assembled. You fit the front wheel, handlebar, pedals, and seatpost, then check brake alignment and torque the fasteners to the figures in the manual. Most people finish in 30-45 minutes with the supplied tools.
What range should I actually expect?
Between 25-40 mi (40-64 km). Heavy throttle use, a loaded bike, cold weather, and hills push you toward the lower figure; moderate assistance on level ground with correct tire pressure gets you toward the upper one.
How long does a full charge take?
5-6 hours from empty on the supplied charger. The charger tapers current as the pack fills and cuts off on its own, so it will not overcharge if you leave it connected a little longer than needed.
Is it legal to ride on the road?
Assistance is available up to 25 mph. Many United States jurisdictions cap Class 3 pedal assistance at 28 mph and restrict throttle use above 20 mph, so the controller can be set to a compliant limit from the display. Confirm your state and local rules before riding on public roads.
What rider height does it suit?
The frame suits riders from 5 ft 3 in to 6 ft 3 in (160-190 cm). Standover and reach matter more than total height, so if you are near the edge of that band, check standover clearance before ordering.
Can I ride it in the rain?
Yes, in normal wet weather. The electrical connections, controller, and display are sealed against spray. Avoid riding through standing water deep enough to submerge the hub or the battery connector, and do not use a pressure washer to clean it afterwards.
Is this bike suitable for real singletrack?
Yes, for cross-country and light trail use. The 80 mm fork, 27.5 x 2.1 in tires, and hardtail rear end suit fire roads, rolling singletrack, and gravel. It is not built for jumps, drops, or bike-park descents - a long-travel full-suspension chassis is the right tool for that.
Why a 3 x 7 drivetrain instead of a modern 1x setup?
Three chainrings give a very wide overall gear range at low cost and let a loaded rider spin up a steep pitch even with the battery empty. Parts are inexpensive and available everywhere. A 1x drivetrain is tidier but narrows the range unless you fit an expensive wide cassette.
Quick Troubleshooting
Common issues and what to check first.
The motor does not engage.
Confirm the display is on and showing an assist level above zero, then check that the battery is locked in and its connector is fully seated. Squeeze and release both brake levers - a sticking cut-off switch keeps the motor disabled.
Range has dropped noticeably.
Check tire pressure first; a soft tire is the most common cause. Cold weather accounts for 10-20 percent. If range has fallen permanently by more than about a third, the pack is approaching the end of its useful life.
The brakes squeal.
Usually contamination rather than wear. Clean the rotors with isopropyl alcohol and a clean rag, and sand the pad faces lightly on fine paper. If the noise continues, the pads have absorbed oil and need replacing.
The chain slips or shifts poorly.
Turn the barrel adjuster at the shifter a quarter-turn at a time until the chain settles in each gear. If it slips under load in every gear, the chain and sprockets are worn and should be replaced together.
The display shows a fault code.
Switch the system off, wait ten seconds, and switch it back on; transient codes usually clear. Persistent codes are listed in the manual with their meanings - note the code before contacting support.
The bike pulls to one side under braking.
One caliper is likely dragging or misaligned. Loosen the caliper mounting bolts, squeeze the lever hard to centre the caliper on the rotor, then retighten while holding the lever.
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-0834131 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-0834131 pairs a 500 W (750 W peak) brushless rear hub motor, 48 V 13 Ah lithium-ion (624 Wh), a range of 25-40 mi (40-64 km), depending on assist level and terrain, 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 surface you plan to ride.
Squeeze both brake levers; they should firm up well before reaching the grip, and the wheels should not turn with the levers held.
Confirm the battery is locked into its mount and the connector is fully seated.
Check that the quick-release levers on the seatpost and wheels are closed and tight.
Spin each wheel and look for rub against the brake pads or a wobble that suggests a loose spoke.
Switch the system on and confirm the display shows charge level and no fault code.
Test the lights, and fit a helmet before you set off.
Test the assistance at walking pace in a clear space before joining traffic, especially if you are new to the bike.
Service & Policies
Every HKM-0834131 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 25 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 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-0834131 - Ah 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.
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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.
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Request a return within 30 days of delivery.
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Refund processed within 10 business days.
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Returns & Exchanges Overview
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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.
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Delivery Time Summary
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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
