HKM-7928403 Fat Tire E-Bike Runs a 1500W Hub at a 20 mph Ceiling and Weighs 70.5 lb With a 330 lb Rating in Red

1500W · 864Wh · 20 mph · 70.5 lb · red or yellow · 7-speed · twin red coils · 330 lb load

Seventy Pounds of Steel With a Twenty Mph Ceiling Built InA Red Frame Lighter Than It Looks

A 20-inch fat bike that weighs 70.5 lb, which is where this one separates from its heavier siblings. A 1500W hub, an 864Wh pack, a 20 mph ceiling, twin red coil shocks and Shimano seven-speed gears. It carries 330 lb and comes in red or yellow, and the weight is low enough that one person can lift it onto a rack. The frame wears a carbon-weave side panel in place of an engine cover, and the red springs are the only colour that is not black on the black build.

The frame is a squared loop with a carbon-weave panel filling the triangle, a long bench and a round headlamp in a caged shell. The bench sits on two red coil shocks with reservoirs, the fork is a straight-leg unit with a crown brace, and the tyres are 20 x 4.0 knobbys on black spoked rims.

Seventy pounds is the number to hold on to. It is half the weight of the heaviest bikes here, which means it goes onto a hitch rack without a ramp, and it still carries the same 330 lb. The trade is a frame that transmits more of a rough track up through the bench than a 136 lb build does.

At a Glance

• 1500W Rear Hub — 48V system, single motor
• 48V 18Ah Pack — 864Wh behind the side panel
• 20 mph Ceiling — Fits the Class 2 throttle limit
• 20 to 37 Miles — Listed range
• 70.5 lb — Half the weight of the heaviest here
• Shimano 7-Speed — Trigger shifter at the right grip
• Twin Red Coils — Rear shocks with reservoirs
• Mechanical Discs — Front and rear
• 20 x 4.0 Tires — Knobby casing on spoked rims
• 330 lb Load — Same rating as the heavy builds
• Red or Yellow — Frame colour is the choice
• Long Bench — Moped length, fixed

Squared Frame at Seventy Pounds

The frame is a squared loop in red or yellow with a carbon-weave panel in the triangle and a long bench over the rear wheel. A round headlamp sits in a caged shell above the front mudguard, and the fork is a straight-leg unit with a brace across the crown.

The wheels are 20 x 4.0 knobbys on black spoked rims. Spokes can be trued with a key, and the wide casing is what makes 70.5 lb feel planted rather than skittish on gravel. Run them at 15 psi on pavement and 8 on sand, and check the spoke tension after the first fifty miles.

The rear end runs two coil shocks with red springs and visible reservoirs, which is more than a hardtail at this price. Brakes are mechanical cable discs at both ends with a barrel adjuster at the lever, and the drivetrain is a Shimano seven-speed derailleur with a trigger shifter.

• Frame: squared loop, red or yellow
• Battery: 48V 18Ah behind the panel
• Wheels: 20 in spoked, 4.0 knobby
• Fork: straight leg with a crown brace
• Rear: twin coil shocks, red springs
• Brakes: mechanical cable disc

Fitted as shipped: the caged headlamp, front and rear mudguards, the long bench, a kickstand and the pedals. The bars carry the throttle, the assist switch, the brake levers and a display, and the side panel covers the controller and the charge port.

1500W at a 20 mph Ceiling

The motor is a 48V 1500W rear hub with a listed 20 mph ceiling. That pairing is deliberate: plenty of torque off the line, but a top speed that keeps the bike inside the Class 2 throttle limit in most states. If you want the legal version of a fat bike rather than the fastest one, this is the trade you want.

The pack is 48V 18Ah, 864Wh, behind the side panel. The listed range is 20 to 37 miles, and at 70.5 lb the bike uses less of that battery climbing than a heavier build would. Charge it through the port in the panel, and keep the bike out of a freezing garage while it charges.

Because it is light for the class, the 330 lb rating is the surprise. Most 70 lb fat bikes are rated at 264 lb; this one carries the same load as the 136 lb builds. That is the reason to pick it if you are a heavier rider who still wants a bike that goes on a normal rack.

Who It Fits and How It Rides

The bench is long and low and the bars are high, so it suits riders from about 5 ft 5 in to 6 ft 3 in. The 330 lb rating covers a heavy adult with a pack, and at 70.5 lb the bike goes on a hitch rack without a ramp. Shorter riders will find the reach long, so sit on one before ordering.

On gravel and packed dirt it tracks straight and the red coils keep the bench level, and the fat casing floats over sand. On pavement the 20 mph ceiling keeps it civil, though the knobbys hum above 15 mph. It is a fire road and campground bike rather than a commuter.

• Fire roads and gravel tracks
• Campgrounds and private ground
• A heavy rider who wants a lighter bike
• Not for tight singletrack or long road rides

What's in the Box

Before the first ride: fit the front wheel and torque the axle, set the bars square to the fork, set the rear shock preload for your weight, bed the cable discs in with ten firm stops and charge the pack. Budget 40 to 60 minutes, and check every fastener after the first hour of riding.

Color and Finish

Red and yellow are the two frame colours, and both keep the springs, fork, rims, bench and side panel black. The red build is the more restrained of the two; the yellow one is bright enough that the bike reads at a distance, which is worth something on a shared trail.

Touch-up paint is available in both frame colours. The wear points are the panel edges where a knee rubs them, the bench edges and the fork lowers where roost hits them.

Battery Care and Maintenance

Charge between 20 and 90 percent for everyday use and take it to full about once a month. The pack sits behind the side panel rather than lifting out, so charge it where the bike is parked and keep that spot above freezing. If the bike will sit for a month, leave it around half charge.

Check tyre pressure before every ride at 15 psi on pavement and 8 on soft ground, and check the spokes and axle nuts after the first 50 miles. The cable discs need the barrel adjuster turned as the pads wear. Keep the chain oiled so the seven gears shift, and reset the shock preload if the rider changes.

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-7928403 · fat tire electric bike · 48V 1500W rear hub with a 20 mph listed ceiling and a Shimano 7-speed drivetrain · 48V 18Ah 864Wh pack behind a carbon-weave side panel · 20 to 37 miles listed range · mechanical cable disc brakes front and rear · straight-leg fork with twin red coil shocks at the rear · 20 x 4.0 knobby tires on black spoked rims · squared frame in red or yellow with a long bench · 70.5 lb, 32 kg, with a 330 lb load rating · sized 5 ft 5 in to 6 ft 3 in · charger in the box · UL listed · built for fire roads, gravel and campgrounds rather than bike lanes · 70.5 lb so one person can rack it without a ramp · the same 330 lb rating as the heavy builds · a 20 mph ceiling that keeps it inside the Class 2 throttle limit in most states