HKM-9628499 Fat Tire Electric Dirt Bike Runs a 750W Hub on an 864Wh Pack for 30 Miles With a Dual Crown Coil Fork

750W · 864Wh · 16-30 mi · 20 in · dual crown fork · 330 lb load · Shimano 7

Dual Crown Coil Fork Coil Rear Shock And A Lockable Battery CaseLow Slung Miles On Wide Fat Tires

A fat tire electric dirt bike in a low-slung moto frame, a 750W brushless geared hub in the rear wheel, and a 48V 18Ah pack worth 864Wh in a key-locked case on the down tube. A dual crown coil fork and a coil-over shock, mechanical disc brakes at both wheels and 20 x 4.0 tires. Listed at 16 to 30 miles per charge, a 20 mph throttle setting, and a 330 lb load rating, with brown or orange saddles and a passenger pad.

The format is a small electric dirt bike rather than a bicycle: a welded carbon steel low-slung frame, a long saddle with a second pad behind it, and the battery case sitting in the down tube where the mass stays low. 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 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
• 864Wh Pack — 48V 18Ah, key-locked and removable
• 16 to 30 Miles — Throttle to pedal assist per charge
• 20 mph Throttle — As configured for US riding
• Dual Crown Fork — Coil fork with exposed springs
• Coil-Over Shock — One spring under the saddle
• Mechanical Discs — Front and rear with rotors
• 20 x 4.0 Fat Tires — Three-layer casings for loose ground
• Shimano 7 Speed — Thumb shifter on the bars
• LCD Display — Speed, battery and assist level
• 33.9 kg Net — 330 lb load rating
• Two Saddles — Brown or orange as listed

A Low Slung Frame With Pedals

The frame is welded carbon steel in a low-slung moto layout, with a long saddle and a second pad behind it. Steel is heavier than aluminium and it is also what keeps a frame like this affordable and repairable, and the welds want an inspection 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 low-slung 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 with a passenger pad, and the LCD on the bars keeps speed, battery state and assist level in one place.

Where the Miles Come From

The pack is 48V 18Ah, worth 864Wh, and it sits in a key-locked case in the down tube rather than bolted outside 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 five to six hours.

We quote 16 to 30 miles per charge, the span the maker lists: the low end on throttle alone and the high end with pedal assist on level ground. Hills, cold weather, soft sand and a heavy load all cut into it, so treat 30 as the ceiling and plan around the rides you actually take, not the brochure. Charge soon after a ride rather than parking it warm and empty overnight.

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 dual crown coil fork shows its springs in the open, and under the saddle a coil-over 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 three-layer 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.

• Field tracks and fire roads
• Sandy lots and snow days
• Short two-up runs on the passenger pad
• Dusk riding with the round headlight
• 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 frame, two saddles: brown saddle on black rims or orange saddle on silver alloy rims, with a matte black frame, black fork legs and knobby tires under both. The saddles are synthetic leather over foam with a wipe-clean surface, and the round headlight carries a guard over its lens.

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-9628499 · fat tire electric dirt bike · low-slung frame in welded carbon steel · 750W from a brushless geared rear hub · removable key-locked 48V 18Ah pack worth 864Wh · 16 to 30 miles per charge, throttle to pedal assist · 20 mph throttle setting as configured · five to six hour charge · dual crown coil fork and a coil-over shock · mechanical disc brakes front and rear · 20 x 4.0 three-layer fat tires · Shimano seven-speed thumb shifter · LCD with speed, battery state and assist level · five assist levels and a walk mode · long saddle with a passenger pad · 33.9 kg net weight · 330 lb load rating · brown or orange saddle · fire roads, field tracks, sand, snow and the paved last mile