HKM-7558355 Fat Tire E-Bike Runs a 750W Hub on 20 x 4.0 Tires With a Brown Bench Saddle and Seven Speeds in Black

750W · 624Wh · 20 x 4.0 · 123.9 lb · brown saddle · round headlamp · 7-speed · mechanical discs · 330 lb

Twenty Inch Tires a Round Lamp and a Frame That Hides the PackA Brown Saddle on Black Steel Frame

A 20-inch fat bike in black or silver with a 750W hub, a 48V 13Ah pack worth 624Wh in the down tube and a brown bench saddle. A round headlamp on a tall bracket, twin rear coil shocks, mechanical discs and 20 x 4.0 tyres on spoked rims. It weighs 123.9 lb, carries 330 lb, and it is listed at 20 to 37 miles. The battery sits in a boxed down tube with its own lock, and the frame is available in gloss black or silver-grey.

The frame is a moped loop with the battery in a boxed down tube and a brown bench that runs over the rear wheel, held by two coil shocks with orange adjuster rings. The headlamp is a round unit on a tall bracket above the front fender, and the bars are a high-rise bend with a cross brace.

At 123.9 lb it is a heavy machine, and the reason is the steel frame and the 330 lb rating. That is the honest trade: you get a bike that does not flex under a heavy rider, and you give up the ability to lift it onto a roof rack or carry it up stairs.

At a Glance

• 750W Rear Hub — 48V system, single motor
• 48V 13Ah Pack — 624Wh in the down tube
• 20 to 37 Miles — Listed range
• Twin Coil Shocks — Orange adjuster rings
• Mechanical Discs — Front and rear
• 20 x 4.0 Tires — Knobby casing on spoked rims
• Brown Bench — Long saddle over the rear wheel
• Round Headlamp — On a tall bracket
• 123.9 lb — Steel frame and a 330 lb rating
• 330 lb Load — Rated carry weight
• 7-Speed Drivetrain — Derailleur at the rear wheel
• Black or Silver — Two frame colours

Moped Frame and a Round Lamp

The frame is a black or silver moped loop with the battery in a boxed down tube and a brown bench running over the rear wheel on two coil shocks. The headlamp is a round unit on a tall bracket above the front fender, and the bars are a high-rise bend with a cross brace.

The wheels are 20 x 4.0 knobbys on spoked rims with black hubs, and the tyres carry a Chaoyang casing mark. Spokes can be trued with a key after a knock, and the wide casing is what lets a 123.9 lb bike cross sand without digging in.

The rear suspension is two coil shocks with orange adjuster rings, which is enough for a curb and a rutted track without the weight of a linkage. Brakes are mechanical cable discs at both ends with a barrel adjuster at the lever, and the drivetrain is a seven-speed derailleur.

• Frame: moped loop, black or silver
• Battery: 48V 13Ah in the down tube
• Wheels: 20 in spoked, 4.0 knobby
• Fork: straight leg with fender
• Rear: twin coil shocks, orange rings
• Brakes: mechanical cable disc

Fitted as shipped: the round headlamp, front and rear fenders, the brown bench, a kickstand and the pedals. The bars carry the throttle, the assist switch and the brake levers, and the down tube box has its own lock and charge port.

750W and 624Wh

The motor is a 48V 750W rear hub driving through a seven-speed derailleur. On a 123.9 lb bike the motor is doing real work, which is why the gears matter: you can drop a cog and add leg power instead of holding the throttle open and watching the battery bar fall.

The pack is 48V 13Ah, 624Wh, in the down tube box. The listed range is 20 to 37 miles: 37 is pedalling at low assist on flat ground, 20 is throttle and hills. Charge it through the port on the box where the bike is parked.

The weight and the rating go together. A 123.9 lb frame that carries 330 lb is built for an adult with a pack, and it stays planted at speed. It is not a bike you push home, so plan the loop on the lower range figure rather than the higher one.

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. At 123.9 lb it is a two-person lift onto a truck bed, which is the main practical limit on the bike.

On gravel and packed dirt it tracks straight and the twin coil shocks keep the bench level, and the fat casing floats over sand. On pavement it is heavy and the knobbys hum above 15 mph. It is a fire road and campground bike, and it wants a ramp or a truck rather than a rack.

• Fire roads and gravel tracks
• Campgrounds and private ground
• A heavy rider who needs the 330 lb rating
• Not for stairs a roof rack or a bike lane

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 spring preload for your weight, bed the cable discs in with ten firm stops and charge the pack. Budget 40 to 60 minutes, most of it on the front wheel, and check every fastener after the first hour.

Color and Finish

Two frame colours, gloss black and a silver-grey, both with a brown bench, black fenders, fork, bars and rims. The only other colour is the orange adjuster ring on each rear shock, which is the one detail that stops the bike reading as all-black.

Touch-up paint is available in both frame colours. The wear points are the down tube box where a boot rubs it, the bench edges 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 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, and the pads are a five-minute swap. Keep the chain oiled so the seven gears 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-7558355 · fat tire electric bike · 48V 750W rear hub with a 7-speed drivetrain · 48V 13Ah 624Wh pack in the down tube · 20 to 37 miles listed range · mechanical cable disc brakes front and rear · twin coil shocks with orange adjuster rings at the rear · 20 x 4.0 knobby tires on spoked rims · brown bench saddle and a round headlamp on a tall bracket · 123.9 lb with a 330 lb load rating · sized 5 ft 5 in to 6 ft 3 in · gloss black or silver-grey · charger in the box · UL listed · built for fire roads and campgrounds rather than commuting · a boxed down tube with its own lock and charge port · a brown bench held by two coil shocks with orange rings · 330 lb rating so a heavy rider is not the limit