HKM-1037523 Electric Dirt Bike Runs a 1500W Peak Hub on 20 x 4.0 Tires With a 48V 25Ah Pack and Hydraulic Shocks

1500W · 1200Wh · 30 mph · 20 x 4.0 · hydraulic shocks · hydraulic discs · IP67 · 99.2 lb · 365 lb load

Sealed Electrics Hydraulic Shocks and a Three Hundred Pound LoadRain Mud and Absolutely No Excuses

A moto-style off-road e-bike with a 1500W peak hub, a 48V 25Ah pack worth 1200Wh that lifts out of the frame, and 20 x 4.0 knobby tires on spoked rims. Hydraulic shocks front and rear, hydraulic disc brakes at both ends, an IP67 sealed system and a 365 lb load rating on a 99.2 lb bike. It tops out at 30 mph, it is 64 inches long with a 40 inch wheelbase, and it is built for dirt, fire roads and trailheads rather than a bike lane.

The shape is a scaled-down dirt bike: a long flat seat that runs into the rear fender, an orange fork set at the front, a battery filling the space where a tank would be and a triple-clamp headstock with a round LED lamp bolted to it. At 64 inches long with a 40 inch wheelbase it is a small machine, but the 26.7 inch bar and the 40 inch height mean an adult sits on it rather than over it.

What separates it from the fat-tire cruisers is the hardware: coil-over hydraulic shocks at both ends rather than plain springs, hydraulic calipers gripping the rotors instead of cables, and an IP67 rating on the electrics, which is the difference between a bike you can hose down and one you cannot. It also carries 365 lb, which is 100 lb more than most bikes in this size class.

At a Glance

• 1500W Peak Hub — Single rear motor, 48V system
• 48V 25Ah Pack — 1200Wh, lifts out to charge
• 65 Miles — Max range, low assist
• 30 mph Top Speed — Listed figure
• Hydraulic Shocks — Coil over, front and rear
• Hydraulic Discs — Front and rear calipers
• IP67 Sealed — Mud, rain and sand
• 20 x 4.0 Tires — Off-road knobby, spoked rims
• 99.2 lb — Frame and battery together
• 365 lb Load — Adult plus gear
• 64 in Long — 40 in wheelbase, 26.7 in bars
• Smart LCD — Trip, voltage, PAS and indicators

Moto Frame and Twenty Inch Wheels

The frame is a moto shape with the battery box standing in for a fuel tank, a flat seat that runs back into the fender and an orange fork up front held by a triple clamp. It is 64 inches long with a 40 inch wheelbase, which is short enough to flick between trees and long enough that it does not feel nervous at 30 mph on a fire road.

The wheels are 20 x 4.0 knobbys on spoked rims, which is the size that gives you float in sand and grip in mud without the steering going vague. Spokes can be trued with a key after a hard landing, and the rims are laced rather than cast for exactly that reason. Run them soft off road and harder on gravel; the casing is what absorbs the first inch of a root.

Suspension and brakes are the reason this costs more than a cruiser. Both ends run coil-over hydraulic shocks with visible reservoirs, and the damping is oil rather than friction, so it does not fade when you use it hard. The brakes are hydraulic calipers on vented rotors front and rear, with the levers set for a two-finger pull.

• Frame: moto shape, battery in the tank space
• Battery: 48V 25Ah, removable
• Wheels: 20 in spoked, 4.0 knobby
• Fork: hydraulic coil over, triple clamp
• Rear: hydraulic coil over shock
• Brakes: hydraulic disc, front and rear

Fitted as shipped: a round LED headlamp, a smart LCD with trip, voltage and assist readouts, front and rear fenders, a side stand and the pedals. The bars carry the throttle, the assist switch and the brake levers, and the whole electrical system carries an IP67 rating, so a river crossing or a muddy track does not end the ride.

1500W Peak and the 1200Wh Pack

The motor is a 48V brushless hub rated at 1500W peak, driving the rear wheel through a single-speed drivetrain. Peak is the number the listing quotes, and it is the one that matters off road, where you want a short burst to clear a step rather than a long pull. The 30 mph top speed is the listed figure, and on a 20-inch knobby that is already fast on loose ground.

The pack is 48V 25Ah, 1200Wh, and it comes out of the frame for charging, so you can leave the bike in a shed and charge the battery indoors. A full charge runs 8 to 10 hours on the supplied charger, and the listed maximum range is 65 miles at low assist on flat ground. Off road, at speed, with a heavy rider, expect a fraction of that.

The IP67 rating is worth pausing on, because it is the specification most bikes at this price leave out. It means the motor, controller and display are sealed against dust and against jets of water, so washing the bike down or splashing through a ford is within the design rather than a gamble. It is not a submarine rating, and the charge port still needs to be dry before you plug it in.

Who It Fits and How It Rides

The seat is 40 inches off the ground at the bars and the bike suits riders from 4 ft 9 in to 6 ft, which makes it one of the few machines in this class a teenager and an adult can share. The 365 lb load rating covers a heavy adult with a pack, and it is the figure to check if you are over 220 lb, because most bikes here are rated at 264.

On dirt, gravel and grass it is in its element: the shocks take a root or a rock without bottoming, the knobbys bite, and the short wheelbase lets you pick a line late. On pavement it is loud, the seat is thin and 30 mph arrives quickly, so treat it as a machine for the trailhead rather than the commute. Check whether off-road vehicles are allowed where you plan to ride before you unload it.

• Dirt tracks, fire roads and grass
• Trailhead and campground riding
• Shared use with a teenager at low assist
• Not for bike lanes or public roads

What's in the Box

Before the first ride: fit the front wheel and torque the axle, check the stem and bar clamps, set the shock preload for your weight, bed the hydraulic brakes in with ten firm stops and charge the pack. Budget 40 to 60 minutes, most of it on the front wheel, and check every fastener after the first hour of riding because a new off-road bike will loosen a few.

Color and Finish

Matte black covers the frame, battery box, fenders, seat and rims, and the orange is concentrated in the fork lowers, the shock springs and the ring around the headlamp. There is a white spider graphic on the battery cover and GT16 lettering on the frame, and the finish is a satin black rather than a gloss, which hides trail dust better.

Touch-up paint in matte black is available on request. The wear points are the fork lowers where roost hits them, the battery cover where boots scuff it and the rear fender under the seat.

Battery Care and Maintenance

Charge the pack between 20 and 90 percent for daily use and take it to full about once a month so the cells balance. The pack lifts out with a key, so the routine is to carry it indoors and charge it at room temperature rather than leaving the bike on a cold charger. Store it around half charge if the bike will sit for a month, and let it warm up before charging after a winter ride.

Off road, the checks are different from a street bike. Wash the bike after a muddy ride but keep water away from the charge port, check the spokes and the axle torque after every hard landing, and look at the hydraulic lines where they pass the fork leg for rub marks. Check the pads monthly, keep the chain oiled, and check the shock preload if you change riders.

Specifications

Frequently Asked Questions

Service and Policies

Coverage that lasts beyond the box. Orders ship free with a tracking number in 2 to 5 business days. From delivery, the product is protected for 180 days against manufacturing defects and transit damage, returnable within 30 days for a full refund, and covered by a 24-month parts-and-labor warranty on manufacturing defects. Four policies, one idea: ship it free, protect it for 180 days, take it back for 30, and stand behind it for two years.

HKM-1037523 · moto style off-road electric bike · 48V brushless rear hub, 1500W peak · 48V 25Ah 1200Wh pack, removable from the frame · 65 miles maximum range · 30 mph top speed · hydraulic disc brakes front and rear · coil-over hydraulic shocks at both ends under a triple-clamp fork · 20 x 4.0 off-road knobby tires on spoked rims · 64 in long, 40 in wheelbase, 26.7 in bars · 99.2 lb with a 365 lb load rating · sized from 4 ft 9 in · IP67 sealed electrics · smart LCD with trip and voltage · round LED headlamp · front and rear fenders · matte black with an orange fork and springs · charger in the box · UL listed · built for dirt tracks, fire roads and trailheads rather than bike lanes