HKM-8285011 Soft PU Bench Fat Tire E-Bike Runs a Geared 1000W Hub at 20 mph and Rides 30 to 50 Miles on an 840Wh Pack

1000W · 840Wh · 30 to 50 mi · fat tire · hydraulic discs · 7-speed · walk mode · 330 lb load · 98.1 lb

Twin Rear Shocks Hydraulic Discs and a Pack That Comes IndoorsQuiet Confidence on Loose Ground

A 20-inch fat tire e-bike with a 1000W geared rear hub, a 48V 17.5Ah pack worth 840Wh in a key-locked down tube case, and hydraulic discs on both wheels. A coil fork up front and two rear coil shocks under a soft PU bench, Shimano seven-speed gears and a color LCD with five assist levels and a walk mode. It is listed at 30 to 50 miles with 20 mph on the throttle as configured, weighs 98.1 lb and carries 330 lb on a carbon steel step-over frame, and it arrives about 85 percent assembled.

The hydraulic brakes are what separates this bike from the cable-disc machines at the same price. On a 98.1 lb frame carrying a rider and a rack load, the calipers squeeze both rotors with a light lever pull, the pads wear evenly, and the bite point stays where you set it instead of walking outward as a cable stretches. Wet gravel and a long descent are where that shows first. The design reads well in person.

Everything else is deliberately plain and serviceable: a carbon steel step-over frame, a coil fork, two rear coil shocks, a seven-speed drivetrain and one display in the middle of the bar. Nothing here needs a laptop, and the pack lifts out for indoor charging. It is the build that avoids being the weak option in any one category.

At a Glance

• 1000W Geared Hub — Brushless rear hub, seven speeds
• 840Wh Pack — 48V 17.5Ah, key-locked and removable
• 30 to 50 Miles — Listed range per charge
• Full Suspension — Coil fork and two rear coil shocks
• 30 to 50 Miles — Listed range per charge
• 20 mph As Configured — Throttle ceiling out of the box
• 7-Speed Drivetrain — Shimano, thumb shifter
• 20 x 4.0 Tires — Beach, mountain, gravel, snow
• 5 Assist Levels — Plus throttle and walk mode
• 330 lb Load — 150 kg rated carry weight
• 98.1 lb Net — 44.5 kg before the rider
• Color LCD — Speed, assist level and pack state

Hydraulic Discs and Real Suspension

Hydraulic discs on a bike this weight change how the whole ride goes. The calipers work both rotors with a two-finger pull, the pads wear evenly, and the lever does not creep outward as a cable stretches. Long gravel descents and wet ground are where the difference shows first.

The suspension is full rather than token. A coil fork with about 80 mm of travel takes the sharp hits up front, and two coil shocks under the bench keep the rear wheel in contact when the surface breaks up. Together they keep the saddle level over washboard and roots.

The frame is carbon steel in a step-over shape, which is the reason the bike weighs what it does and the reason it can carry 330 lb without flexing under a heavy rider at speed. Steel welds cleanly, it tolerates a knock, and any shop can repair a cracked tab rather than scrap the frame.

• Frame: carbon steel, step-over
• Pack: 48V 17.5Ah, 840Wh, key-locked
• Motor: 1000W geared rear hub
• Fork: coil, about 80 mm travel
• Rear: two coil shocks under the bench
• Brakes: hydraulic disc, both wheels

Fitted as shipped: a bright LED headlight in a black cage, front and rear fenders, a soft PU bench, a kickstand and platform pedals. The bars carry the throttle, the Shimano thumb shifter, the hydraulic levers, the color LCD and a motor switch that cuts power without touching the screen.

1000W and the 840Wh Pack

The 1000W geared hub is the middle of this class and the right size for a 98.1 lb bike. It pulls a loaded rider up a gravel grade and holds speed into a headwind at lower current than the 1500W machines, which is why an 840Wh pack still reaches the top of the listed range. The Shimano seven-speed drivetrain is the other half of that figure: dropping a gear on a climb keeps the motor in its efficient band.

The pack is 48V 17.5Ah, worth 840Wh, and it lifts out of the down tube behind its own lock for indoor charging. The range is listed at 30 to 50 miles per charge and the charger takes five to seven hours from empty. Treat 50 as the flat-ground pedal-assist figure and plan a loop around 30, because soft sand, a heavy rider and throttle use all take their share.

Five assist levels and a walk mode live on the color display, and the throttle is there for the moments when spinning a 98.1 lb bike through soft sand would only dig a hole. Walk mode earns its keep at this weight when a slope is too loose to ride, and the motor switch at the bar cuts power without taking a hand off the grip.

Every Surface From Sand to Snow

The 20 x 4.0 knobbies are why the terrain list on this bike runs beach, mountain, gravel and snow. At 8 to 12 psi the casing floats over sand and wet grass; at 20 psi it rolls quietly on pavement and carries a load without squirming.

Weight is the sweet spot at 98.1 lb: heavy enough to stay planted on loose ground at speed, light enough that one person can load it onto a hitch rack, and easier again if the pack comes out first.

• Beach sand and dunes
• Mountain gravel and fire roads
• Snow, wet grass and rail trails
• Not for stairs or a roof rack

What's in the Box

About 85 percent assembled on arrival: fit the handlebar, the front wheel and the pedals, torque the axle, set the bars square to the fork, bed the hydraulic pads in with ten firm stops from a walking start, then charge the pack for five to seven hours.

Color and Finish

The bike is black throughout: frame, fork, fenders, rims and bench, with a red pinstripe along the battery case doing the only bright work on the frame. The saddle is a soft PU bench and it comes in black or in brown, which is the one choice the rider gets over the look of the machine.

Wear shows first at the pack opening, the chainstay and the fork stanchions. Clear film on the chainstay before the first ride covers most of the chain slap, and a wipe of the fork legs after a wet ride keeps grit out of the seals.

Battery Care and Maintenance

One full charge before the first ride, then keep the 840Wh pack inside the 20 to 90 percent band for daily use and take it to full about once a month so the cells balance. Charge indoors at room temperature rather than straight off a hard ride, and leave the pack near half charge if the bike will sit for a month. The lock and the seal want a wipe after wet days.

Each ride starts with a tyre pressure check at 8 to 20 psi depending on the surface and a squeeze of both hydraulic levers. Pads want eyes every few hundred miles, and the system wants a bleed every season or two; a lever that creeps to the bar is the signal. Check the axle nuts and the pack lock monthly and keep the chain clean so the seven speeds shift.

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-8285011 · 20 inch fat tire electric bike · 1000W brushless geared rear hub driving a Shimano seven-speed drivetrain · 48V 17.5Ah 840Wh pack, key-locked and removable from the down tube · 30 to 50 miles listed range · five to seven hour charge · carbon steel step-over frame · coil fork with about 80 mm of travel and two coil shocks under the bench · hydraulic disc brakes front and rear · 20 x 4.0 knobby tires for beach, mountain, gravel and snow · color LCD with five assist levels, throttle and walk mode · soft PU bench in black or brown · bright LED headlight, fenders and a side stand · 98.1 lb net with a 330 lb load rating · about 85 percent assembled · charger and two keys in the box · built for sand, gravel, snow and rail trails rather than stairs or a roof rack