HKM-9497427 Step Over Fat Tire Electric Dirt Bike Soaks up Bumps on Full Suspension with a 720Wh Key Locked Pack

750W · 720Wh · 17-31 mi · 20 in · rear shock · 330 lb load · Shimano 7

Mechanical Discs Rear Shock and a Removable Pack for City TrailsWeekend Miles on Wide Black Tires

A fat tire electric dirt bike with a welded carbon steel step-over frame, a 750W brushless geared hub in the rear wheel, and a 48V 15Ah pack worth 720Wh in a key-locked case that lifts out for charging. A suspension fork and a rear shock, mechanical disc brakes at both wheels and 20 x 4.0 knobby tires. Listed at 17 to 31 miles per charge, a 20 mph throttle setting, and a 330 lb load rating, in matte black.

The format is a small electric dirt bike rather than a bicycle: a welded carbon steel step-over frame, a long saddle, and the battery case sitting on the down tube where the mass stays low and centered. The pack locks with a key and lifts out for charging at a desk or on a workbench. It suits fire roads, field tracks, sand and snow, and the paved last mile of a commute where the hard surface runs out. The kickstand is there too, so it parks on a trail edge without laying over.

The trade is honesty about rules. A 750W throttle bike is not a street motorcycle and in many states it sits outside the Class 1 to 3 e-bike definitions, so it belongs on private land and trails where the law allows. The throttle setting is 20 mph as configured, the pedals and the seven gears are real, and a helmet is not optional at any speed.

At a Glance

• 750W Hub Motor — Brushless geared rear hub
• 720Wh Pack — 48V 15Ah, key-locked and removable
• 17 to 31 Miles — Throttle to pedal assist per charge
• 20 mph Throttle — As configured for US riding
• Suspension Fork — Travel up front over the fat tire
• Rear Shock — One damper under the saddle
• Mechanical Discs — Front and rear with rotors
• 20 x 4.0 Fat Tires — Knobby casings for loose ground
• Shimano 7 Speed — Thumb shifter on the bars
• LCD Display — Speed, battery and assist level
• 77.4 lb Net — 35.1 kg, 330 lb load rating
• Matte Black — One finish as shown

A Dirt Bike Frame With Pedals

The frame is welded carbon steel in a step-over layout, braced at the head tube and the bottom bracket where a 750W hub pulls hardest. Steel is heavier than aluminium and it is also what keeps a frame like this affordable and repairable, and the welds are the part to inspect after a hard season.

The motor is a 750W brushless geared hub in the rear wheel, with the controller inside the frame instead of a box under the seat. A geared hub trades a little top-end for pull from a stop, which is what a loaded bike on a steep track actually needs.

Behind it sits a seven-speed Shimano drivetrain with a thumb shifter, so the pedals are a real fallback when the pack runs flat and a way to keep the motor in its efficient band on climbs. The bike pedals like a heavy bicycle, which is exactly what it is.

• Welded carbon steel step-over frame
• 750W brushless geared hub
• Five assist levels and a walk mode
• 7-speed Shimano thumb shifter
• Twist throttle on the bars
• LCD with speed, battery and assist

On throttle alone the bike pulls to about 20 mph and holds it on flat ground, the setting it ships with. The saddle is long, the bars are wide, and the LCD on the left keeps speed, battery state and assist level in one place.

Where the Miles Come From

The pack is 48V 15Ah, worth 720Wh, and it sits in a key-locked case on the down tube rather than hidden in it. It lifts out for charging at a desk or in an apartment, which matters when the bike lives in a garage without power. A management system balances the cells and guards against overdraw and over-discharge, and the supplied 48V charger fills it from empty in about six to eight hours.

We quote 17 to 31 miles per charge, the conservative span: about 17 miles on throttle alone and up to 31 miles with pedal assist on level ground. The maker poster runs as high as 35 miles and some reseller pages higher still, which assumes a light rider, low assist and perfect ground. Cold weather, hills and soft sand all cut into the number, so treat 31 as the ceiling and plan around the rides you actually take.

Riding style decides the rest. Five assist levels let you trade effort for miles, a walk mode helps you push the bike up a slope, and tire pressure matters more than most riders expect: the fat casings want around 20 psi on pavement and 8 to 10 psi when sand or snow is on the menu.

Fire Roads Sand and Snow

Up front a suspension fork takes the sting out of ruts and roots, and under the saddle a rear shock keeps the back wheel tracking instead of skipping. Together they keep the wheels planted on washboard and rocky track, and mechanical discs at both ends park it predictably once bedded in.

The 20 x 4.0 knobby casings are the other half of the story: wide enough to float over soft sand and snow at low pressure, and hard enough to roll cleanly when the commute is mostly pavement.

• Fire roads and gravel tracks
• Sandy lots and snow days
• Daily loops with a loaded bag
• Not for stairs or a roof rack

What's in the Box

The bike arrives 85 percent assembled: fit the handlebar, the front wheel and the pedals with the supplied toolkit, then charge the pack fully before the first ride. Check both brake rotors for true, set the bars square to the fork, and recheck the axle nuts after the first ten miles.

Color and Finish

One finish: matte black across the frame, the fenders and the battery case, with black fork legs, black rims and knobby tires under it. The bright pieces are the brake rotors and the clear lens of the round headlight, and the finish is a powder coat over steel rather than a wet paint.

The wear points are the fork stanchions and the chainstay, which want a wipe after wet and muddy rides, and the saddle corners where a strap rubs.

Battery Care and Maintenance

Charge the pack indoors between 10 and 30 degrees C, and never charge a frozen pack: plating a cold cell costs capacity permanently, so let it warm first. Give it one full charge before the first ride, unplug when the light turns green, and store it around 60 percent charge if the bike will sit for a month.

Each ride starts with a tire pressure check against the terrain and a squeeze of both brake levers. Mechanical pads want a look every 200 miles, since a worn pad scores the rotor, and the chain wants a wipe and a drop of lube after wet rides. Check the spoke tension after the first few outings, keep the axle nuts tight, and never aim a pressure washer at the connectors or the charge port.

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-9497427 · fat tire electric dirt bike · step-over frame in welded carbon steel · 750W from a brushless geared rear hub · removable key-locked 48V 15Ah pack worth 720Wh · 17 to 31 miles per charge, throttle to pedal assist · 20 mph throttle setting as configured · six to eight hour charge · suspension fork and a rear shock under the saddle · mechanical disc brakes front and rear · 20 x 4.0 knobby fat tires · Shimano seven-speed thumb shifter · LCD with speed, battery state and assist level · five assist levels and a walk mode · 77.4 lb net weight · 330 lb load rating · IP65 rated · matte black finish · round LED headlight · fire roads, field tracks, sand, snow and the paved last mile