RadExpand 5 Electric Folding Bike

The Rugged Space-Saver

The bike built for big fun is also designed to fit small spaces.

Side view of a black RadExpand 5 electric folding bike

Fold in to store. Fold out to explore.

Our latest folding ebike has fatter tires to tackle adventures of all sorts. Featuring a step-thru frame, you can customize your ride with adjustable handlebars, seven speeds, and four levels of pedal-assist.

"I love the fact that this is such an approachable and affordable bike."

Electric Bike Review

"The most exciting e-bike of 2022 is way cheaper than you’d expect."

What’s the range?

Up to 45+ miles per charge

How much can it carry?

275 lb.

How powerful is the motor?


Ebikes built to handle your everyday.
Man sitting on a beach next to an electric folding bike

Size guide

Tailor-fit comfort. For every rider.


30" bike inseam

Slide the scale for your bike inseam measurement

RadExpand 5

You will be able to pedal and stand over the frame comfortably.


Katya's measurements: bike inseam 30"/ 76cm, height 5'4'/ 163cm

Dive deeper

Select a feature to explore in detail.

Side view of a black RadExpand 5 electric folding bike

Design driven

Each piece designed for a purpose.

Woman walking out of store with a cup of coffee and books, walking towards her step-thru RadExpand folding electric bike

Easy to get on & off

As the smallest ebike in our lineup, you can simply step thru and ride. No need to swing your leg over the saddle — or struggle to make it over your gear.

A man carries a folded RadExpand ebike out of a trailer

We lightened the load

Our engineers zeroed in on reducing the bike's weight, making it even easier to fold, lift, and store.

Close up of the wide front tire on a RadExpand ebike

Fearlessly fun

Dirt-caked roads, look out. Rugged fat tires help you tackle rough terrain.

A man relaxes in an RV next to a folded black RadExpand ebike

An RV-ready ebike

In a tight spot? The RadExpand is a smart fit for RVs, small apartments, or anywhere else you may be short on space.

Accessorize Your Ebike

Rad Fat Tire Wheel Lock installed on an ebike, showing the orange key and with the optional security chain attached.
Long Security Chain which is a length of steel links covered by a nylon sheath
From $49
Close up photo of Rad Power Bikes Rad Mirror mounted on left side of electric bike handlebar inboard of grip, brake level, and assist level controller.
Large black basket with a wooden base
Close up picture of gub pro cell phone mount on bicycle riser handlebars next to ebike display with turned on phone in mount
upclose image of LCD Display Upgrade accessory
Rad Trailer with standard flatbed design, two wheels and a yellow safety flag.
Side view of the Rad Trailer Pet Insert, showing how the top window unzips and the side pocket for extra storage. Also shows reflector on the rear door.
The Hardshell Locking Pannier is a durable plastic storage box with a reflective stripe on the side, locks with 2 included keys.
Hardshell Locking Box is a black storage container with a top access keyhole.
A close-up view of a matte black Enhanced Comfort Saddle, a wide and cushy bike saddle
Free standing Hollywood Racks Sport Rider Ebike Hitch Rack without ebikes
Rad Trailer Cargo Bin
Save $10
Close up view of black, metal Front Rack for Rad ebikes.
$59 $69
Close-up of the Water Bottle Holder on its own.
Save $30
ABUS Hyban 2.0 Helmet
$49 $79
Save $19
Cutaway view of Tannus Armour between an innertube and a tire.
From $76 $95
A black framed bike light with a reflector and power cable attached
Save $19
Rad Small Basket Bag with reflective strip
$30 $49
Close up, angled side view of black metal Large Basket. The basket is rectangular with support bars on the bottom and sides.
up close angle image of black rack platform
Save $29
Front view of Rad's large basket bag with folding flap and reflective strip
$30 $59
Save $5
Detail view of Rad Reflective Safety Stickers
$10 $15
Set of 3 ebike basket cargo straps
Front right detail view of the Comfort Saddle
Save $20
Battery travel case closed
$39 $59
Save $10
A black rectangular bag with see through screens, a handle and zipper.
$99 $109
Rad Colored Grips Blue
Detail view of Water Bottle with Rad Power Bikes logo
Close up side view of black Fremont Pannier Bag rolled closed with side straps attached and silver reflective strip across the side.
Save $15
Close-up of the Roadside Repair Tool Kit unrolled, showing tools in place and the QR code to scan to go to our online help center.
$34 $49
Detail front side view of the Rad Small Basket
Save $10
Saddle Bag with Rad Power Bikes logo on it
$15 $25
Top down detail view of the Cargo net laid flat
Save $20
Forward-facing close-up of the Small Basket Roll Top Liner. The bag is rolled up and fastened with its buckle.
$59 $79
Save $30
Angled close-up of the Large Basket Roll Top Liner, with its top rolled up and with its handles ready for carrying.
$79 $109
Close up photo of Rad Power Bikes Handlebar Bag not mounted on bike, showing mounting straps
Save $30
Pet Basket Liner
$29 $59
Rad Comfort Grip image
Close up picture of Rad Power Bikes Rad logo taillight not on a bike where you can see part of the mounting strap.
Side view of a black Hudson MIPS bike helmet.
Bern Brentwood helmet with MIPS protection in a matte tan color
Full view of Hollywood Racks RV Rider Rack on plain background
Small Front-Mounted Basket
Save $24
Handlebar mitts for winter riding on an electric bike
$55 $79
Safety & Quality

Engineered to put safety first

Explore our first-class safety features for all rider types.

Close-up of grip and brake lever on a Rad Power Bike.

Safety certified

Rad frames are designed to meet international standards, including the guidelines set by the U.S Consumer Product Safety Commission and European Committee for Standardization.

Reliable service and support.

Free, fast shipping

Wait less, ride more. Enjoy fast, free shipping on all ebike orders.

Learn More

1 year warranty

Ride in confidence. We’ve got you covered.

Learn More
Book & magnifying glass icon representing the Rad help center

Explore our Help Center

Can’t choose a bike? Need to fix a flat? We’re here to help.

Learn More


  • Battery

    672 Wh
    Bikes shipped to NYC are compliant with UL 2849 and 2271.

  • Charger

    48V, 2 Amp Rad Power Bikes smart charger, operates on 100V-240V AC power outlets

  • Controller

    Rad Power Bikes controller, 48V, 750W

  • Display

    Rad Power Bikes custom LED display with Charge indicator, pedal assist level / error display, headlight/taillight indicator and more

  • Hub Motor

    750W brushless geared hub motor, 5:1 planetary gear reduction. Stated wattage is the manufacturer’s rated power capacity. Actual power-to-ground wattage is under 750W to ensure ebike regulatory compliance and may vary depending on riding conditions.

  • Lights

    Front: Rad Power Bikes branded standard LED
    Rear: Integrated taillight with brake light indicator functionality

  • Pedal Assist

    Low-Profile Cadence Sensing Pedal Assist, Half-Grip Twist Throttle

  • Range

    25 - 45 miles per charge (estimate)

  • Throttle

    Half twist grip throttle

  • Wiring

    Water resistant connectors and wiring harness

To ensure uninterrupted shipping, some parts may differ from those listed. Rest assured, our engineers rigorously test each component to guarantee quality and compatibility.


  • Brake Calipers

    Mechanical caliper

  • Brake Levers

    Rad Power Bikes approved aluminum alloy levers with motor cutoff switch.

  • Brake Pad

    Semi-Metallic compound

  • Brake Rotors

    180 mm front and rear

  • Chain

    KMC Z7, 124 links

  • Crank Set

    48T, 170 mm forged alloy, dual-sided chainring guard

  • Derailleur

    7-Speed MicroShift RD-M26

  • Fenders

    Full coverage front and rear fenders with hardware included

  • Fork

    Rad custom steel 135 mm hub width, 9 mm quick release

  • Frame

    6061 aluminum

  • Freewheel

    7-speed freewheel 14-32T

  • Gearing

    1 x 7-speed

  • Grips

    Ergonomically designed, made of soft yet durable rubber

  • Handlebar

    Alloy, 27" wide, 6.9" rise

  • Headset

    Semi-integrated, 1-1/8" straight steerer tube

  • Kickstand

    Side-mounted, adjustable lean angle

  • Pedals

    Composite platform, CrMo axle with reflectors, standard 9/16" x 20 TPI threading

  • Racks

    Front: Optional, 30 lb (14kg) carrying capacity
    Rear: Integrated, 55 lb (25kg) carrying capacity

  • Rims

    Aluminum alloy, 36 hole
    Rim width: 60 mm

  • Saddle

    Rad Power Bikes with lifting handle

  • Seatpost

    Aluminum alloy, 390 mm x 27.2 mm

  • Seatpost Clamp

    31.8 mm diameter

  • Shifter

    MicroShift TS71-7 -R under bar thumb shifter, 7-speed

  • Spokes

    12-gauge stainless steel, black

  • Stem

    45 mm length, + 3º rise.

  • Tires

    CST BFT 20" x 4.0", e-bike rated with puncture-resistant liner and reflective strip

To ensure uninterrupted shipping, some parts may differ from those listed. Rest assured, our engineers rigorously test each component to guarantee quality and compatibility.


Title Text
Rider Heights 4'10" - 5'10"
(Approx. bike inseam between 24.5" - 32.25")
Frame Size 16"
Handlebar Height 45-48"
Handlebar Reach 16"
Seat Height 24" - 31"
Measured from bottom of the pedal stroke
Standover Height 16"
Total Length 68"
Wheelbase 45"
Dropout Width 175 mm rear dropout width, 12 mm axle diameter, 10 mm flats
Bottom Bracket Shell Width 100 mm shell, 164 mm spindle
Seat Tube Length 16"
Effective Top Tube 23.5"
Chainstay 18"
Handlebar Width 690 mm (27.2")
Crank Length 170 mm
Seatpost Diameter 27.2 mm
Max Tire Width 4"
Bike Weight Total: 62.5 lb (with battery)
Battery: 7.7 lb
Payload Capacity 275 lb
Rear Rack Capacity 59 lb
Folded Dimensions 29H x 25W x 41L"


Bike inseam sizing chart(Inches)

23 - 24.5"

24.5 - 32.25"


You will not be able to ride the bike comfortably.
You will be able to pedal and stand over the frame comfortably.
Your legs may be too long to get full leg extension when pedaling.
What to Measure

Your “bike inseam” — or inside leg length — is the distance between your body where it sits on your bike saddle and the ground.

It’s typically an inch or two longer than the length of your trousers, but measure to be sure.

You’ll use this number on the chart to get a feel for how the different models will fit you.

How to Measure

Gather the tools needed:

Medium-width hardcover book
Tape measure
A wall you can stand against
A trusted friend or relative

Wearing your regular riding shoes and with your back to the wall, stand with your feet spread so there is about 7 inches between them - this is about the distance apart your feet would be when straddling a bike with your feet on the ground (standover height).

Place a hardcover book against the wall with the spine of the book facing upward. Slide the book upwards towards your groin until it is solidly against your body. This may be a bit awkward, but is way more comfortable — and safer! — than trying to ride a bike that is too big.

If you have a buddy helping you, get them to measure from the floor to the top of the book spine while you hold the book in place. If you’re going it alone, carefully hold the book in place and measure from the ground to the top of the book spine.


  • LED panel that includes pedal assist controls and battery charge levels.


RadExpand 5 Electric Folding Bike