Electric Bicycles >>
HKM-2570835 36 V 20 Ah City Electric Bike, 250 W Motor, 20 mph Top Speed, 7-Speed Shimano Drivetrain, Hydraulic Disc Brakes
HKM-2570835
250 W 20 mph City Electric Bike
It is worth reading the specification of the HKM-2570835 from the chassis outward rather than from the motor in. Underneath is an aluminum alloy city frame rated to 285 lb, on 28 in (700c) wheels with 700 x 40c tires, stopped by hydraulic disc brakes and running a rigid fork tuned around wide 40c tires.
Key Features
8 details that make the HKM-2570835 a dependable ride.
250 W Mid-drive Centre Motor
Rated 250 W continuous with 450 W available for starts and short climbs, this motor produces about 65 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.
36 V 20 Ah Lithium Pack (720 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 6-7 hours.
720 Wh Hidden Battery for Genuine Long Range
A 36 V 20 Ah pack stores 720 Wh - roughly double what a typical 250 W city bike carries. Paired with a motor that draws modestly, the practical result is a commuter that runs most of a working week on one charge. The pack lifts out through the down tube hatch with the supplied key for charging at a desk.
Hydraulic Disc Brakes at Both Ends
Hydraulic disc brakes, front and rear, 160 mm rotors. Braking is the system that has to scale with power and weight, and on a 48 lb bike travelling at 20 mph that is not a place to economise. Both levers carry a cut-off switch that removes motor drive the instant either is pulled.
7-Speed Shimano Derailleur
The 7-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.
700 x 40c Tires
Puncture-resistant urban tread with reflective strip 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.
Aluminum Alloy City Frame
Welds are dressed and the frame is rated for a combined rider and cargo load of 285 lb (129 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.
Internal Routing and Low-Maintenance Details
Gear and brake lines run inside the frame, out of the weather and away from snagging. Combined with sealed cartridge bearings, hydraulic brake lines that cannot rust, and puncture-resistant 40c tires, the bike is built to need attention a few times a year rather than a few times a month.
Overview
Built for the ride ahead.
It is worth reading the specification of the HKM-2570835 from the chassis outward rather than from the motor in. Underneath is an aluminum alloy city frame rated to 285 lb, on 28 in (700c) wheels with 700 x 40c tires, stopped by hydraulic disc brakes and running a rigid fork tuned around wide 40c tires. Those parts decide how the bike behaves; the 250 W drive and the 720 Wh pack decide how far and how fast it goes. Most of the design effort on the HKM-2570835 went into what you cannot see. The battery is fully enclosed in the down tube, the cables run inside the frame, and the motor sits at the bottom bracket where a chainset would normally be. The result is a bike that does not advertise itself as electric - useful if you park in a public rack every day. The drive system is mid-drive centre motor, rated 250 W continuous with 450 W available in short bursts and roughly 65 N.m of torque.
Firm, Progressive Hydraulic Brakes
Hydraulic brakes give the HKM-2570835 a firm, progressive bite you can feel through the lever.
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-2570835 pairs a 250 W (450 W peak) mid-drive centre motor, 36 V 20 Ah lithium-ion (720 Wh), a range of 40-62 mi (64-100 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 40-62 mi (64-100 km) per charge.
The 36 V 20 Ah pack stores about 720 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 40-62 mi (64-100 km) rather than a single number. A full charge takes 6-7 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; 700 x 40c 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. Hydraulic 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 28 in (700c) wheel carrying 285 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-2570835 City Electric Bike
1 x HKM-2570835 city electric bike
1 x 36 V 20 Ah Lithium Battery Pack with Two Keys
1 x 36 V 20 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-2570835
6 reasons it earns its place.
36 V 250 W Mid-Motor City Electric Bike with Hidden 20 Ah Battery
Everything on this bike is chosen around one job. The 250 W motor, the 720 Wh pack, and the aluminum alloy city frame with fully internal cable routing 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.
Range From Capacity
The pairing of a modest 250 W motor with a 720 Wh pack is deliberate. Energy used per mile stays low, so the same battery that gives a 750 W bike 30 mi gives this one 40-62 mi. For a commuter that is the more useful trade.
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 7-speed shimano drivetrain means the bike still works as a bicycle when the pack is empty.
Discreet Enough to Park Anywhere
No external pack, no visible controller box, no hub motor bulging out of the rear wheel. The bike looks like a tidy aluminum city bike in a rack, which is worth as much as a lock in a busy city centre.
Lower Cost and Quieter Than Driving
A full charge costs a few cents of electricity and covers 40-62 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.
Light, Stiff Alloy Frame
An alloy frame keeps the HKM-2570835 light to lift yet stiff to ride.
Designed so the only thing you steer is your own route. The finish is the kind you notice with your hands before your eyes. The HKM-2570835 pairs a 250 W (450 W peak) mid-drive centre motor, 36 V 20 Ah lithium-ion (720 Wh), a range of 40-62 mi (64-100 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-2570835 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
No throttle is fitted; assistance is delivered through the pedals and metered by the sensor in the drive unit.
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 7-speed shimano drivetrain. Ease off the pedals as you shift under motor power.
Frequently Asked Questions
Quick answers about the HKM-2570835.
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 40-62 mi (64-100 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?
6-7 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 delivered through the pedals only and stops at 20 mph, which corresponds to the Class 1 bracket used across most of the United States. That is the category with the widest access to bike lanes, greenways, and shared paths, though rules still vary by state, county, and park district - confirm before you ride.
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 250 W enough for hills?
For city gradients, yes. The motor is mid-mounted, so its 65 N.m of torque is multiplied by the 7-Speed Shimano gearing. Drop two gears at the bottom of a climb and the bike holds a steady pace. It is not intended for sustained mountain gradients with a heavy load.
Can the hidden battery be removed?
Yes. A lockable hatch on the underside of the down tube releases the pack so it can be carried indoors and charged separately. 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.
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-2570835 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-2570835 pairs a 250 W (450 W peak) mid-drive centre motor, 36 V 20 Ah lithium-ion (720 Wh), a range of 40-62 mi (64-100 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-2570835 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 250 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 285 lb (129 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-2570835 - Ah City 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.
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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 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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Start claims or returns quickly and easily.
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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
