HKM-0081363 Steel Frame Fat Tire E-Bike Carries a 750W Hub and a 48V 18Ah 864Wh Pack on 26 x 4.0 Tires with a Lockout Fork

750W · 48V 18Ah 864Wh · 26 x 4.0 · 40 to 55 mi · steel frame · lockout fork · 7-speed · 28 mph

An 864Wh Battery That Leaves the Frame in One Clean Single PieceOne Pack That Lifts off All at Once

A 750W brushless rear hub, a 48V 18Ah 864Wh pack that lifts off the down tube in one piece, 26 x 4.0 tires with a three-layer casing, a lockout suspension fork and mechanical disc brakes, on a steel step-over frame. It is listed at 40 to 55 miles and 28 mph, with a 7-speed Shimano trigger shifter for the days you would rather pedal it than throttle it. Rack, fenders, headlight and kickstand are already bolted on.

The battery decides how this bike lives with you. It sits in a hard case bolted to the down tube rather than disappearing into the frame, so the charge window reads without switching anything on, the whole pack lifts off in one motion, and a replacement in three years is a box rather than a frame. Steel is the other choice, and a thin-walled steel triangle takes the buzz off chip seal in a way a stiff alloy frame at this price does not.

What that costs is weight, and 70.5 lb with the pack is the number to be honest about. It is a two-person lift into a truck bed and it is not going up a stairwell twice a day. The external case also puts mass where a frame battery would not, so the bike feels slightly nose-heavy when you push it rather than ride it.

At a Glance

• 750W Rear Hub — Brushless hub with throttle and pedal assist
• 864Wh Pack — 48V 18Ah, lifts off the down tube, key-locked
• 40 to 55 Miles — Pure electric at one end, pedal assist at the other
• 26 x 4.0 Tires — Three-layer casing, thickened rubber over woven metal
• Steel Step-Over Frame — Thin-wall steel triangle, matte black
• Lockout Fork — Suspension up front, rigid rear triangle
• 7-Speed Shimano — Trigger shifter, for hills and flat packs
• Mechanical Discs — Front and rear, cable actuated
• 70.5 lb Complete — 32 kg with the battery in the case
• 76 in Long — 44.9 in tall and 27.2 in across the bars
• Rear Rack — Frame mounted, with a reflector at the tail
• LCD Display — Speed, battery, assist level and trip

Steel Frame and a Lockout Fork

The frame is a steel step-over triangle, 76 in from tire to tire and 44.9 in tall, with the bars 27.2 in across. Steel is heavier than alloy and it is why the ride is calm rather than sharp: the tubes flex a little over a cracked lane where an alloy frame sends the whole thing into the saddle.

The 864Wh pack lives in a hard case clamped to the down tube, key-locked and wired through a sealed port. It comes off in one piece, which is what makes charging practical in a flat with no garage and what makes winter storage possible without leaving a full battery in the cold.

Up front there is a suspension fork with a lockout lever, and at the rear a rigid triangle that carries the rack. On four-inch tires that is the right split: the casing absorbs the small stuff, the fork takes the hits, and the rigid rear keeps a loaded rack level.

• Frame: steel, step-over, matte black
• Battery: 864Wh hard case on the down tube, key-locked
• Fork: suspension with a lockout lever
• Rear: rigid triangle, frame-mounted rack
• Brakes: mechanical disc, front and rear
• Drivetrain: Shimano 7-speed, trigger shifter

Fitted as shipped: front and rear fenders, a rear rack with a reflector at the tail, an LED headlight, a kickstand and an LCD with three buttons. The 7-speed Shimano shifter is trigger type, so you can drop a gear with a thumb without letting go of the grip.

750W Hub and 864Wh of Pack

The motor is a 750W brushless rear hub with a throttle on the right grip and pedal assist through the display. It is not the biggest hub in this class and it does not need to be, because on four-inch tires the limit on soft ground is traction rather than power: 750W keeps a loaded bike rolling through gravel and packed sand instead of spinning the wheel and digging in. It is quiet, too, which a direct drive hub is not.

The pack is 48V 18Ah, 864Wh, and the figure that matters as much as the capacity is the shape. Because it is a removable case rather than an integrated frame battery, it charges on the bike through the sealed port or off it on a bench, and the listed charge time is seven to eight hours on the supplied charger, so it is an overnight job rather than something you do between errands.

Range is listed at 40 to 55 miles, and the two numbers are two different ways of riding: 40 is throttle-heavy use with a rider aboard, 55 is pedal assist at a steady pace. Cold weather, soft ground and a headwind all pull it down, so a 15-mile round trip lands at two charges a week rather than one.

Who It Fits and How It Rides

The maker lists riders from 5 ft 7 in to 6 ft 11 in, and the geometry is tall rather than low: a step-over top tube, a long wheelbase and four inches of tire under the saddle. Riders at the short end will be on tiptoe at a light, so sit on one before ordering.

On gravel and packed sand it is stable and unhurried, and the 26-inch wheel rolls over broken ground a 20-inch fat bike feels. On pavement the tread hums and the steering is slow. The discs are steady rather than sharp at 70 lb.

• Rail trails, fire roads and gravel loops
• Beach towns and packed sand
• Snowed-in lanes and farm tracks
• Not for tight singletrack, stairs or a third-floor walk-up

What's in the Box

Before the first ride: fit the front wheel and check the axle, set the saddle and bar height, check both brake levers and bed the pads in with ten firm stops from a walking start, then charge the pack fully. Get help lifting it out of the carton at 70.5 lb, and keep the box for the first month.

Color and Finish

Matte black covers the frame, fork lowers, fenders, rack and rims, with a black cockpit and saddle, and the only colour comes from the orange sidewall reflectors. It is a scheme chosen to survive mud rather than to photograph well, and scratches read as patina.

Touch-up paint in the matching black is available on request. The wear points are the chainstay under the chain and the frame where the rack stays bolt on.

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 management system can balance the cells. An 864Wh case takes most of a night, so start it in the evening, and bring it indoors rather than leaving it in a cold shed over winter.

Check tire pressure before every ride: 18 to 20 psi on pavement, 8 to 12 psi on sand and snow, and use a gauge rather than a thumb because four-inch casings hide how soft they are. Check the pads monthly and the cable tension at the lever, since mechanical discs settle in over the first hundred miles, and check the rear spoke tension after the first 20 rides, because a hub motor loads that wheel harder than a bicycle hub does.

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-0081363 · 26 in fat tire electric bike · 750W brushless rear hub · 48V 18Ah 864Wh hard case on the down tube, key-locked and removable · 40 to 55 miles listed range · 28 mph as configured · Shimano 7-speed with a trigger shifter · mechanical disc brakes front and rear · suspension fork with a lockout lever and a rigid rear triangle · 26 x 4.0 tires with a three-layer casing · 76 in long, 44.9 in tall, 27.2 in across the bars · steel step-over frame · LCD display · throttle and pedal assist · LED headlight · front and rear fenders · rear rack with a tail reflector · 70.5 lb complete · matte black · seven to eight hour charge · built for rail trails, fire roads, beach and snow rather than tight singletrack