700c 9-Speed Electric Road Bike
HKM-338003 Electric Road Bike
The HKM-338003 is built around a 250 W brushless rear hub motor (400 W peak) and a 36 V 10 Ah lithium pack (360 Wh), matched so the pack is never the limiting factor on a long day out. 700 x 28c tires at 70-80 psi roll efficiently on tarmac and stay composed over chip seal and patched bike lanes, while a rigid fork and a compliant seatpost keep the front end precise without adding weight. Hydraulic disc brakes at both ends give repeatable stopping power, and the 9-speed Shimano derailleur adds usable cadence from walking pace up to cruising speed. A backlit display, integrated LED lighting, and an aluminum alloy frame rated for 265 lb round out a bike sized for daily use rather than an occasional weekend loop. Expect 31-43 mi (50-69 km) from a full charge depending on how much you pedal.
250 W rear hub motor36 V 10 Ah / 360 Wh Pack20 mph Top Speed31-43 mi Range700 x 28c TiresHydraulic disc brakesRigid fork265 lb Load Capacity
Motor
250 W
400 W peak rear hub
Battery
36 V 10 Ah
360 Wh removable lithium
Top Speed
20 mph
32 km/h
Range
31-43 mi
50-69 km, varies with assist
Tires
700 x 28c
Multi-surface tread
Load Capacity
265 lb
120 kg rider plus cargo
Overview
The HKM-338003 is an electric road bike built on an aluminum alloy frame. Aluminum keeps the weight manageable for a bike in this power class while resisting the road salt and wet weather a commuter bike sees every winter. The frame is rated for a combined rider-and-cargo load of 265 lb, and the bike itself weighs roughly 40 lb with the battery installed.
Power comes from a 250 W brushless rear hub motor (400 W peak). Nominal output is what the motor sustains; the peak figure is what it delivers in short bursts on a climb or pulling away from a stop. Rated torque is about 40 N.m, which is what makes the difference on a loaded start rather than raw wattage. The pack is a 36 V 10 Ah lithium pack (360 Wh) and recharges in roughly 4-5 hours from empty.
Real-world range is a band, not a number. Throttle-only riding at the top of the speed range lands near the low end of 31-43 mi. Moderate pedal-assist on mixed terrain regularly reaches the middle of that band, and steady pedalling at the lowest assist level on flat ground is what produces the high figure. Cold weather below 40 F (4 C), soft tires, headwinds, and hills all pull the number down.
The fork is rigid, which is the right choice on a road bike - every watt goes into forward motion instead of into fork travel, and tire pressure becomes the main comfort adjustment. Tire pressure is the fastest comfort adjustment available - a few psi either way changes the ride quality more than any other single change you can make.
Key Features
250 W Brushless Rear Hub Motor
A 250 W brushless motor (400 W peak) is laced directly into the rear wheel. There is no belt or secondary chain in the drive path, so losses stay low and maintenance comes down to keeping the axle nuts torqued. Peak output is what pulls the bike away from a standing start on a grade with a loaded rack.
36 V 10 Ah Lithium Pack (360 Wh)
The pack holds 360 Wh, enough for 31-43 mi of mixed riding between charges. It locks into the frame and lifts out with a key so it can be charged at a desk while the bike stays locked outside. A full charge from empty takes about 4-5 hours; partial top-ups take proportionally less and do no harm to the cells.
Rigid Fork and Compliant Seatpost
The road fork is rigid so nothing absorbs your pedalling input. Comfort comes from frame compliance, a shaped seatpost, and tire pressure - the three things that actually matter at road-bike weights.
Hydraulic disc brakes, Front and Rear
Sealed hydraulic lines actuate both calipers. Lever effort stays light and predictable when the rotors heat up on a long descent, and there is no cable to stretch or corrode. Motor cut-off switches in both levers drop drive the instant either lever moves.
9-Speed Shimano Derailleur Drivetrain
A 9-speed cassette with an index shifter gives usable cadence from walking pace up to the top of the assisted speed range. The gear spread is what lets a heavier rider hold a climb without stalling the motor, and what makes the bike rideable at all once the pack is empty.
700 x 28c Tires
700 x 28c tires are the modern road compromise: wide enough to run 70-80 psi and stay comfortable on chip seal, narrow enough to keep rolling resistance and frontal area low. Clearance allows a slightly wider casing if you ride rough surfaces.
LED Headlight and Brake-Activated Tail-Light
Both lights run off the main pack, so there are no coin cells or USB lamps to keep charged. The tail-light brightens whenever either brake lever is pulled, which is the single most useful visibility feature in slow traffic and at dusk.
Road Cockpit and Bottle Mounts
Drop bars with a compact reach, integrated brake and shift levers, and two bottle mounts inside the front triangle. Mudguard and rack eyelets are provided at the rear dropouts for riders who commute on the same bike they train on.
Full Specifications
Model
HKM-338003 | Electric Road Bike
Frame Material
Aluminum alloy, road geometry
Motor
250 W brushless rear hub motor, 400 W peak
System Voltage
36 V DC
Battery
36 V 10 Ah lithium-ion (360 Wh), removable and lockable
Charger
Smart charger, 100-240 V input, auto cut-off
Charging Time
4-5 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent of rated capacity
Top Speed
20 mph (32 km/h)
Range Per Charge
31-43 mi (50-69 km), varies with terrain, rider weight, and assist level
Climbing Grade
Up to approximately 25 degrees with a solo rider
Peak Torque
40 N.m
Drivetrain
9-Speed Shimano derailleur with index shifter
Brakes
Hydraulic disc brakes, front and rear, with motor cut-off levers
Suspension
Rigid fork, compliant seatpost
Tires
700 x 28c, low-profile road tread
Wheels
700c alloy rims, stainless spokes, sealed hub bearings
Saddle
Performance road saddle with cro-mo rails
Display
Backlit LCD: speed, battery level, assist mode, trip distance, odometer
Throttle
Cadence pedal assist, 5 levels plus zero assist
Lighting
LED headlight and brake-activated tail-light, powered by the main pack
Load Capacity
265 lb (120 kg) rider plus cargo
Bike Weight
Approximately 40 lb (18 kg) including battery
Recommended Rider Height
5 ft 6 in to 6 ft 5 in (168-196 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 36 V 10 Ah pack stores 360 Wh. For reference, a typical commuter e-bike ships with 400-600 Wh, so this one sits inside that band. Energy capacity, not motor wattage, is what decides whether the bike gets you home, and it is the single specification worth paying attention to when comparing models.
Four variables move real-world range more than anything else: how much you pedal, total loaded weight, tire pressure, and terrain. Throttle-heavy riding at the top of the speed range returns close to 31 mi. Moderate pedal-assist on rolling terrain sits mid-band. Steady pedalling at the lowest assist level on flat ground is what produces the 43 mi figure. Temperatures below 40 F (4 C) temporarily reduce available capacity by 10-20 percent; it comes back as the pack warms.
Tip: Store the pack between 30 and 70 percent charge if the bike will sit for more than a month, and top it up every 4-6 weeks. Charging indoors at room temperature rather than in an unheated garage measurably extends usable pack life.
The pack unlocks with the supplied key and lifts out of the frame in a few seconds, so it can charge at a desk while the bike stays locked outside. Two keys are included. Charging in place works equally well - the charge port is reachable without removing anything, and the charger cuts off automatically when the pack is full, so a top-up left running while you eat lunch does no harm.
Daily Use & Care
- Check tire pressure before every second or third ride. 70-80 psi suits most riders on 700 x 28c; drop 5-10 psi on rough chip seal for a noticeably calmer ride.
- Rinse the frame, rims, and drivetrain with fresh water after riding on salted roads or wet gravel. Road film attacks fasteners and bearing seals if it is left to dry in place.
- Check that the axle nuts, stem bolts, and rack fasteners are torqued before the first ride of each week. Motor torque works hardware 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 heavy dust.
- Inspect brake pad thickness monthly. Hydraulic pads wear quietly until they are gone; replace when the friction material is under 1 mm.
- Charge indoors at room temperature and unplug once the indicator turns green rather than leaving the charger connected for days at a time.
- Keep the display cover and charge-port cap closed whenever the bike is parked outdoors so moisture stays out of the connectors.
What's in the Box
- 1 x HKM-338003 electric road bike, approximately 85 percent pre-assembled
- 1 x 36 V 10 Ah removable lithium battery pack (360 Wh)
- 1 x Smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and pedal spanner
- 1 x Pair of alloy platform pedals
- 1 x Front LED headlight (pre-installed)
- 1 x User manual, assembly guide, and warranty card
Frequently Asked Questions
How much assembly is required out of the box?+
The bike ships approximately 85 percent assembled. What remains is fitting the front wheel, straightening and bolting the handlebar, installing the pedals and saddle, and checking brake alignment. Budget 30-45 minutes with the supplied tools. If you are not comfortable torquing the stem and axle hardware, have a bike shop check it before the first ride.
What range should I actually plan for?+
Plan for 31-43 mi (50-69 km). Throttle-heavy riding at the top of the speed range lands near 31 mi; moderate pedal-assist on mixed terrain sits mid-band; steady pedalling at low assist on flat ground produces the 43 mi figure. Rider weight, headwinds, hills, cold weather, and low tire pressure all reduce it.
How long does the battery take to charge?+
About 4-5 hours from fully empty with the supplied charger. Partial top-ups take proportionally less time, and there is no benefit to running the pack down before recharging - lithium cells prefer partial cycles.
Is the battery removable for indoor charging?+
Yes. It unlocks with the supplied key and lifts out of the frame, so you can charge it indoors while the bike stays locked outside. You can also charge it in place through the frame-side port.
Can I pedal it if the battery runs out?+
Yes. The 9-speed Shimano derailleur works independently of the motor. The bike weighs about 40 lb, so unassisted pedalling is slower than on a conventional bicycle, but it is entirely rideable home on flat ground.
Do I need a license or registration?+
Rules vary by state and locality. A 250 W motor with a 20 mph top speed falls inside the three-class e-bike framework used by most US states, which normally means no license, registration, or insurance - but class rules on where you may ride still apply. Confirm your local ordinance before riding on shared paths.
Will the brakes cope with the speed and the load?+
Hydraulic disc brakes front and rear are the appropriate specification for a 20 mph bike at this weight. Bed the pads in during the first few rides with 10-15 progressive stops from moderate speed to build the friction layer on the rotors, and brake earlier than you would on an unloaded bicycle when the rack is full.
What size rider does it fit?+
The recommended range is 5 ft 6 in to 6 ft 5 in (168-196 cm). Saddle height covers most of that range; riders at either end should also check standover clearance, which is set by the 700c wheel size and the frame geometry.
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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.
CERoHSUN38.3 Battery360 Wh PackHydraulic BrakesRigid fork265 lb Load
Why Choose the HKM-338003
Sized for the Riding You Actually Do
250 W nominal with 40 N.m is the practical middle of the market: enough to flatten a commute-grade hill and hold 20 mph, without the weight, cost, and registration questions that come with the high-output classes.
Surfaces Other Bikes Route Around
Chip seal, patched tarmac, and the broken edge of a bike lane are where a road bike normally punishes the rider. Wider 700 x 28c casings at moderate pressure plus a compliant frame take that edge off without slowing the bike down.
Two Ways to Ride
Twist the throttle for immediate, clutch-free acceleration, or select one of 5 pedal-assist levels and ride it like a bicycle. Most owners mix the two - throttle away from a stop, assist to hold speed, and pedals to stretch the pack on the way home.
Fewer Parts in the Drive Path
The motor lives inside the wheel hub with no gearbox, belt, or secondary chain to service. Fewer moving parts in the drive path means less to maintain, and the ride is quiet enough to hold a conversation alongside another rider.
Cheap to Run, Simple to Park
A full charge costs a few cents of electricity and covers 31-43 mi. There is no fuel, no oil change, no annual emissions test, and in most towns no parking fee - the bike locks to the same rack a conventional bicycle uses.
Built for Weather, Not Just Weekends
Sealed connectors, a covered charge port, a gasketed battery bay, and stainless hardware at the fasteners most exposed to road film. Ride it in the rain, rinse the salt off afterwards, and the electrical side stays out of the conversation.
Controls & Indicators
Power Button
On the battery pack; hold to switch the system on and off
Mode Buttons
Up and down keys on the display cycle through 5 pedal-assist levels plus zero assist
Assist Sensor
Bottom-bracket sensor reads rider input and scales motor output to match
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 key to toggle the LED headlight and tail-light
Shifter
Right-hand index shifter for the 9-speed rear derailleur
Pre-Ride Safety Checklist
- Check and set tire pressure before rolling out; it is the fastest change you can make to ride quality and range.
- Squeeze both brake levers. They should firm up well before reaching the grip, with none of the sponginess that indicates 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 nothing rubs a pad or the frame.
- Check that 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 assist at walking pace in a clear area before entering traffic, especially if you have changed the assist level or ridden a different bike recently.
- Switch on the headlight and tail-light for any ride near dusk, and wear a helmet rated for the speeds this bike reaches.
- If you are carrying cargo, load it low and centred and re-check braking distance on the first quiet stretch of road.
Quick Troubleshooting
The motor does not engage when I ask for assist.+
Confirm the display is on and shows charge, the battery is locked fully into place, and both brake levers are released - the cut-off switches disable drive while a lever is pulled. If the display shows an error code, note it before powering down and contact support.
Range has dropped noticeably compared with when it was new.+
Check tire pressure first; a soft tire on pavement is the most common cause by a wide margin. Then consider temperature, since cold reduces available capacity temporarily. If range is down more than 30 percent year-round after several hundred cycles, the pack is approaching the end of its service life.
The brakes feel spongy at the lever.+
Sponginess in a hydraulic system usually means air in the line or a fluid leak. Stop riding and have the system bled and inspected. Do not continue riding a 20 mph bike on brakes you are not sure of.
The chain skips under hard pedalling.+
Indexing is most likely out of adjustment, or the chain and cassette are worn. Turn the barrel adjuster a quarter turn at a time until shifts land cleanly. If it skips only in the smallest cogs, the cassette is worn and should be replaced together with the chain.
The ride feels harsh on rough tarmac.+
A rigid fork puts tire pressure in charge of comfort. Drop 5-10 psi and re-ride the same road before changing anything else. Check also that the seatpost clamp is at the correct torque - an over-tightened clamp removes the post flex that softens the ride.
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, write down the exact code and what you were doing when it appeared, then contact support - codes map to specific faults in the controller, motor, throttle, or brake-sensor circuits.
Certifications & Standards
The HKM-338003 is produced in a facility operating under an ISO 9001 quality management system. The cells and the assembled pack carry the test documentation normally required for lithium-ion transport and retail sale, and copies are available on request.
- CE - European Conformity marking covering the electrical assembly.
- RoHS - Restriction of Hazardous Substances compliance for the electronics.
- UN38.3 - Battery transport safety testing, required for lithium-ion shipping by air, sea, and road.
- MSDS - Material Safety Data Sheet available for the battery pack on request.
- ISO 9001 - Quality management system certification held by the manufacturing facility.
Important Safety Notes
This is an electric bicycle capable of 20 mph. Read the manual fully before the first ride and practise assist and brake control in an open, traffic-free area until the response feels predictable. Loaded braking distances are noticeably longer than they are on an unloaded bicycle.
- Wear a helmet on every ride. At 20 mph a bicycle helmet is the minimum; many riders choose a certified downhill or motorcycle helmet at these speeds.
- Do not exceed the 265 lb (120 kg) load capacity, which includes the rider and all cargo.
- Check local law before riding on public roads or paths. A 250 W motor with a 20 mph top speed may fall outside standard e-bike classifications in your area.
- Bed the brake pads in with 10-15 progressive stops during the first few rides before riding at full speed or with a loaded rack.
- Do not ride through water deep enough to reach the wheel hubs or the battery bay.
- Charge only with the supplied charger, indoors, at room temperature, on a non-flammable surface. Do not leave a charging pack unattended overnight.
- Do not open, puncture, or modify the battery pack. A damaged lithium pack can vent and ignite.
- Reduce speed substantially on gravel, wet surfaces, and downhill grades. Narrow tires give up grip quickly once the surface turns loose.
HKM-338003 · 250 W brushless rear hub (400 W peak) · 36 V 10 Ah lithium (360 Wh) · 20 mph top speed · 31-43 mi range · 700 x 28c tires · 265 lb (120 kg) load capacity · aluminum alloy frame · rigid fork · hydraulic disc brakes · 9-speed Shimano derailleur. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. Range figures are measured under moderate pedal-assist on level pavement. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations before riding on public roads.
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