HKM-6968531 Folding Fat Tire E-Bike Runs a 1000W Hub With an 840Wh Pack on 20 x 4.0 Tires and Seven Speeds for the Trunk

1000W · 840Wh · 20 x 4.0 · 58.4 lb · folds at the frame · coil shocks · 7-speed · 330 lb load

A Twenty Inch Fat Folder With an 840Wh Pack and Coil ShocksIt Folds Flat and Goes Anywhere Fast

A folding 20-inch fat bike with a 1000W hub, a 48V 17.5Ah pack worth 840Wh in the frame and a mid-frame hinge. Twin coil shocks with red collars, mechanical discs, 20 x 4.0 knobbys and a COOK-TEK branded battery box on the down tube. It weighs 58.4 lb, carries 330 lb, and it is listed at 18 to 34 miles. The hinge sits in the middle of the main beam, so the folded bike goes in a trunk rather than on a roof rack.

The frame is black with a hinge in the middle of the main beam, which is what makes the folded package small enough to go in a trunk rather than on a rack. The battery sits in a boxed section on the down tube, the bench runs over the rear wheel and the fork is a straight-leg unit with a fender.

At 58.4 lb it is on the light side for a fat folder, and that is the reason to pick it over a rigid 20-inch bike: it goes in the back of a car without a rack, and one person can lift it onto a shelf. The trade is a hinge that needs checking before every ride.

At a Glance

• 1000W Rear Hub — 48V system, single motor
• 48V 17.5Ah Pack — 840Wh in the down tube box
• 18 to 34 Miles — Listed range
• Folding Frame — Hinge in the main beam
• Twin Coil Shocks — Red collars, rear only
• Mechanical Discs — Front and rear
• 20 x 4.0 Tires — Knobby casing on spoked rims
• 58.4 lb — Light for a fat folder
• 330 lb Load — Rated carry weight
• 7-Speed Drivetrain — Derailleur at the rear wheel
• Long Bench — Moped length, fixed
• Black Finish — With red shock collars

Hinged Frame and Fat Tires

The frame is a black loop with a hinge in the middle of the main beam and a boxed section on the down tube that carries the battery and the controller. A long bench runs over the rear wheel and the fork is a straight-leg unit with a fender and a round headlamp on the crown.

The wheels are 20 x 4.0 knobbys on spoked rims, which is the size that keeps a folding fat bike stable at low pressure without making the folded package too big. Spokes can be trued at home, and the wide casing is what lets it cross sand and snow instead of sinking.

The rear end runs two coil shocks with red adjuster collars, which is enough to take the edge off a curb and a rutted track without the weight of a linkage. Brakes are mechanical cable discs at both ends, and the drivetrain is a seven-speed derailleur with a trigger shifter.

• Frame: black loop with a mid-beam hinge
• Battery: 48V 17.5Ah in the down tube box
• Wheels: 20 in spoked, 4.0 knobby
• Fork: straight leg with fender
• Rear: twin coil shocks, red collars
• Brakes: mechanical cable disc

Fitted as shipped: the round headlamp, front and rear fenders, the folding hinge with its quick release, a kickstand and the pedals. The bars carry the throttle, the assist switch, the brake levers and a small display, and the battery box has its own lock and charge port.

1000W and 840Wh

The motor is a 48V 1000W rear hub, which on a 58.4 lb folder is enough to pull away from a stop and climb a loose slope with an adult aboard. The seven-speed derailleur behind it means you can gear down and add leg power instead of relying on the throttle for everything.

The pack is 48V 17.5Ah, 840Wh, in the boxed section on the down tube. The listed range is 18 to 34 miles, and that spread is the honest one for a 1000W motor: 34 is pedalling at low assist, 18 is throttle and hills. Charge it through the port on the box, or where the bike is folded open.

Folding has one maintenance cost: the hinge. Check it is fully seated and the latch is closed before every ride, and look at the hinge pin for play once a month. A folder that is ridden with a loose hinge is the one failure mode that this layout actually has.

Who It Fits and How It Rides

The bench is low and the bars are high, so it suits riders from about 5 ft 4 in to 6 ft 2 in. The 330 lb rating covers most adults with a pack, and the 58.4 lb weight means one person can lift it into a trunk. A tall rider will find the cockpit short, and the hinge limits how hard you can stand on the pedals.

On gravel, grass and snow the coil shocks and the fat casing do the work, and the bike tracks straight. On pavement it rolls smoothly and the knobbys hum above 15 mph. It is at its best as a second bike that lives in a car or a boat, rather than as a daily commuter.

• A second bike that lives in a car
• Campgrounds and gravel tracks
• Beach paths and packed sand
• Not for hard trail riding or stairs

What's in the Box

Before the first ride: unfold the frame and check the hinge latch is fully closed, fit the front wheel and torque the axle, set the bars square to the fork, bed the cable discs in with ten firm stops and charge the pack. Budget 35 to 50 minutes, and recheck the hinge and axle nuts after the first ten miles.

Color and Finish

Matte black covers the frame, battery box, fenders, bench, fork and rims, and the only colour comes from the red collars on the two rear shocks and the white COOK-TEK lettering on the battery box. It is a plain, functional finish with no graphics beyond the brand.

Touch-up paint in matte black is available on request. The wear points are the hinge faces, the battery box where a shoe rubs it and the fork lowers.

Battery Care and Maintenance

Charge between 20 and 90 percent for everyday use and take it to full about once a month. The pack lives in the down tube box, so charge it where the bike is stored and keep that spot above freezing. If the bike will sit for a month, leave it around half charge and top it up every few weeks.

Because it folds, the checks are slightly different: look at the hinge pin and latch monthly, keep the hinge faces clean and lightly greased, and check the battery box lock engages fully. Check tire pressure before every ride, and the cable discs need the barrel adjuster turned as the pads wear.

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-6968531 · folding fat tire electric bike · 48V 1000W rear hub with a 7-speed drivetrain · 48V 17.5Ah 840Wh pack in the down tube box · 18 to 34 miles listed range · mechanical cable disc brakes front and rear · twin coil shocks with red collars at the rear · 20 x 4.0 knobby tires on spoked rims · mid-beam hinge so the bike folds into a trunk · 58.4 lb with a 330 lb load rating · sized 5 ft 4 in to 6 ft 2 in · matte black with red collars · charger in the box · UL listed · built as a second bike that lives in a car rather than a daily commuter · a hinge in the main beam that turns a fat bike into trunk cargo · coil shocks and a long bench over the rear wheel · mechanical discs you can adjust with a barrel turn