HKM-8174547 Folding Fat Tire E-Bike Puts a 750W Hub and a 624Wh Pack on 20 x 4.0 CST Tires and Folds in Seconds

750W · 48V 13Ah 624Wh · 20 x 4.0 · 28 mph · 3 second fold · 2000W peak · 265 lb

A Rated Hub a Real Peak Figure and Tires That Resist PuncturesFigures You Can Actually Trust Today

A 750W rated rear hub with a 2000W peak, a 48V 13Ah 624Wh pack inside the cylindrical main beam, 20 x 4.0 CST puncture-resistant tires, a suspension fork and disc brakes, on an aluminium frame that folds in about three seconds. It is listed at 25 to 31 miles and 28 mph with a 265 lb rating, and it comes in matte black or metallic silver. The lamp sits in the beam, the rack and fenders are fitted, and the whole thing folds into a package you can stand behind a door.

The headlight is the detail that gives this bike away. Instead of bolting a lamp to the fork crown, the maker put it in the front of the main beam, so the beam reads as one continuous tube from the bars to the wheel and the light sits above the fender rather than beside it. That is a styling decision with a practical side: nothing catches on the lamp when you fold the bike or push it through a doorway.

The battery lives inside that same beam, which is why the frame can be a single fat cylinder and still carry 624Wh. It charges through a port on the beam and comes out with a key, so a flat with no garage is workable, and the folded package is short enough to stand behind a door rather than needing a rack.

At a Glance

• 750W Rated Hub — 2000W peak, brand figure
• 624Wh Pack — 48V 13Ah inside the main beam
• 25 to 31 Miles — Listed range, mode dependent
• 20 x 4.0 CST — Puncture-resistant fat casing
• 3 Second Fold — Single frame hinge, no tools
• Suspension Fork — Front travel, rigid rear triangle
• Disc Brakes — Front and rear
• Headlight in the Beam — Lamp built into the main tube
• 7-Speed Shimano — Geared to pedal a flat pack home
• 265 lb Rating — 120 kg for rider and cargo
• Two Colours — Matte black or metallic silver
• 28 mph Listed — Above the Class 3 line in most states

Cylindrical Beam and a Three Second Fold

The frame is a single fat aluminium cylinder running from the steering head to the rear axle, with the battery inside it and a hinge in the middle. Fold it and the bars drop against the front wheel; the maker quotes three seconds, and that is fair once the hinge has bedded in.

Putting the headlight inside the front of that cylinder is the reason the bike looks the way it does. It also means the lamp is protected when the bike is folded or shoved into a car boot, which a fork-crown lamp is not. It is also harder to break, which matters on a bike that gets folded into a boot.

Up front there is a suspension fork and behind the saddle a rigid rear triangle carrying a rack. On 20 x 4.0 tires that is enough for gravel and broken pavement: the casing floats, the fork takes the hits, and the rigid rear keeps a loaded rack level.

• Frame: aluminium cylinder, single hinge
• Battery: 624Wh inside the beam, key-locked
• Fork: suspension, rigid rear triangle
• Brakes: disc, front and rear
• Tires: CST 20 x 4.0 puncture resistant
• Fold: about three seconds, no tools

Fitted as shipped: front and rear fenders, a rear rack with a guard, the integrated headlight, a kickstand and an LCD on the bars. The tires are CST 20 x 4.0 with a puncture-resistant casing, which is a brand you can look up when it is time to replace one.

750W Rated and 2000W Peak

The motor is a 750W brushless rear hub, rated, with the brand quoting 2000W at peak. Both numbers are worth knowing: 750W is what the motor can hold on a long climb, and 2000W is the short burst it can draw from a standstill. Quoting only the second would be misleading, and quoting only the first undersells how the bike leaves a light. It is a geared hub, so it also freewheels when you stop pedalling.

The pack is 48V 13Ah, 624Wh, inside the beam with a key lock and a sealed charge port. It is a middle-sized battery for this class: big enough for a weekend that starts in a car boot, small enough that a full charge does not take all night. Because it sits in the beam rather than on a rack, the folded package stays narrow enough to stand behind a door.

Range is listed at 25 to 31 miles, and the low figure is the one to plan around. A 624Wh pack on four-inch tires will empty quickly if you keep leaning on the peak, so treat 25 as a throttle-heavy day and 31 as steady pedalling on a hard surface. Plan a loop with a charge point at the far end rather than an out-and-back to the limit.

Who It Fits and How It Rides

One frame size covers riders from about 5 ft 2 in to 6 ft 2 in, and the folding beam makes the standover almost irrelevant: you step over a tube rather than swinging a leg across a top tube. The bars adjust in height, which is what does most of the fitting on a bike of this shape.

On gravel and packed sand it floats and tracks straight, and on pavement the fat tread hums and the steering is quick. At 28 mph it is stable in a straight line and less happy in a tight turn.

• Weekends where the bike goes in a car boot
• Beach towns, campsites and gravel paths
• Short errands at 12 to 20 mph
• Not for tight singletrack, stairs or long-distance touring

What's in the Box

Before the first ride: unfold the frame and check the hinge is fully seated, fit the pedals, set the seat post and bar height, check both brake levers, then charge the pack. Fold and unfold it twice at home so you know how the hinge feels before you rely on it in a car park.

Color and Finish

Matte black and metallic silver are the two finishes, both with black rims and a black cockpit, and the silver version in the photographs carries a blue tint on the rims that the black one does not. The silver hides dust better; the black hides scratches better.

Touch-up paint is available on request in both colours. The wear points are the hinge, the stem release and the chainstay under the chain.

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. A 624Wh pack charges in an evening, and the pack comes out with a key, so bring it indoors in winter rather than leaving it in a cold car.

Check tire pressure before every ride at 15 to 20 psi on pavement and 8 to 12 psi on sand, and check the hinge and stem release for play every month, because those two joints carry the whole load on a folder. Check the brake pads monthly, and check the rear spoke tension after the first 20 rides.

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-8174547 · 20 in folding fat tire electric bike · brushless rear hub, 750W rated, 2000W peak, brand figures · 48V 13Ah 624Wh pack inside the main beam, key-locked · 25 to 31 miles listed range · 28 mph listed · 7-speed Shimano drivetrain · disc brakes front and rear · suspension fork with a rigid rear triangle · CST 20 x 4.0 puncture-resistant tires on black rims · headlight integrated into the main beam · rear rack with a guard · front and rear fenders · LCD display · aluminium cylindrical frame · 265 lb load rating · matte black or metallic silver · folds in about three seconds with no tools · built for car boot weekends, beach towns and gravel paths rather than tight singletrack