RadMini Step-Thru 2

Electric Folding Fat Bike

• In stock, ships within 5 business days

$1,499.00

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Winner, Best Folding Electric Fat Bike of 2020
Ebikes from Rad Power Bikes were named the Best Electric Bikes in 7 categories by ElectricBikeReview.com, the most of any electric bike company.

Standard: Arrives 85% assembled (Free)

White Glove: Delivered fully assembled and tuned (Additional fee)

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Hear from Real Rad Owners

"Shocked by the level of quality for the price. It’s amazing."
- Jeremy S.
"It's the best purchase I've made in years! Great customer service also!"
- Stephen S.
"This is an awesome bike. Has lots of power and handles wonderfully."
- Joanna P.

The Rugged Space Saver

The new RadMini Step-Thru 2 encompasses so much of our design philosophy: to make bikes that combine power with ease, convenience, and accessibility. With a streamlined throttle design and handlebars that have been upgraded for a more comfortable, ergonomic ride, we’ve taken that mindset to a whole new level.

The RadMini Step-Thru features our lowest standover height of any model. Add to that the adjustable handlebar stem and the most robust folding mechanism ever built, and you've got a remarkably accessible fat tire ebike.

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Technical specs

Key Features
RadMini Step-Thru Electric Fat Bike Version 2key feature 1

Puncture-Resistant Tires

The integrated tire liner is a line of defense designed to provide extra protection against punctures from thorns, glass, and other small materials.

RadMini Step-Thru Electric Fat Bike Version 2key feature 2

7-Speed, 11-34 Tooth Freewheel

A wider range of gearing at your disposal means more torque for treacherous uphill climbs and maintain pedal authority at top speed.

RadMini Step-Thru Electric Fat Bike Version 2key feature 3

Front and Rear Fenders

Included front and rear fenders made from durable PVC and stainless-steel hardware help protect you from the elements

RadMini Step-Thru Electric Fat Bike Version 2key feature 4

Integrated Brake Light

Powered using the main battery pack and features brake light functionality that is activated any time the brakes are applied.

RadMini Step-Thru Electric Fat Bike Version 2key feature 5

Twist Grip Throttle

750W of power on-demand.

RadMini Step-Thru Electric Fat Bike Version 2key feature 6

Front Suspension Fork

Our custom Rad Power Bikes RST suspension fork has 60 mm of travel, preload adjustment, and lockout.

RadMini Step-Thru Electric Fat Bike Version 2key feature 7

The Strongest Hinge Ever Made for a Folding Ebike

Over-built on purpose, the primary folding hinge has multiple safety redundancies to help prevent accidental unlatching and ensure the RadMini Step-Thru feels solid and secure when locked properly.

RadMini Step-Thru Electric Fat Bike Version 2key feature 8

Low-Step Frame

Featuring a 16" stand over height, this bike is perfect for those needing a more approachable package without sacrificing features or functionality.

Electronics
Battery
48V, 14 Ah (672 Wh) with Lithium NMC Samsung 35E cells, rated for 800 charge cycles

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

Controller
48V, 750W

Display
Backlit LCD with charge indicator, speedometer, odometer, trip odometer, pedal assist level, wattmeter, and more

Hub Motor
750W brushless Bafang geared hub motor with 80 Nm of torque, 5:1 planetary gear reduction

Lights
Front: Standard Rad Power Bikes LED headlight
Rear: Integrated taillight with brake light

Pedal Assist
Intelligent 5 level pedal assist with 12 magnet cadence sensor

Throttle
Half twist throttle

Wiring
Water resistant connectors and wiring harness

USB Ports
Display: 5V, 1 Amp

Bike Components
Brake Calipers
Tektro Aries (MD-M300)

Brake Levers
Aluminum alloy comfort grip levers with motor cutoff switch and integrated bell

Brake Pad Material
Sintered metal

Brake Rotors
Tektro 180 mm front and rear

Chain
KMC Z7

Crank Set
48T, 170 mm ProWheel Pioneer forged alloy, dual-sided aluminum bashguard

Derailleur
7-Speed Shimano Altus

Fenders
Front and rear

Fork
RST spring fork, 80 mm travel, with lockout and preload adjustment

Frame
6061 aluminum

Freewheel
DNP 7-speed freewheel, 11-34T

Gearing
1 x 7-speed

Grips
Durable imitation leather ergonomic grips

Handlebar
Custom formed aluminum, 26" wide, 2.5" rise

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

Kickstand
Heavy-duty aluminum with wide plastic foot

Pedals
Wellgo P256 CrMo axle, forged aluminum folding platform with reflectors, standard 9/16" x 20 TPI threading

Racks
Optional

Rims
Double wall, 36H

Saddle
Velo Plush with lifting handle

Seatpost
Promax, 350 mm x 27.2 mm

Seatpost Clamp
Quick release

Shifter
Shimano SL-TX50-7R thumb shifter, 7-speed

Spokes
12-gauge stainless steel, black

Stem
High-rise folding stem with 3" vertical adjustment

Tires
CST Big Boat 20” x 3”, puncture-resistant liner

Geometry
RadMini Step-Thru Electric Fat Bike Version 2 geometry
Recommended Rider Heights
4'10" - 5'10"

Frame Size
14"

Handlebar Height
45" - 48" (adjustable)

Handlebar Reach
16"

Seat Height
24" - 31"
*Measured from bottom of the pedal stroke

Standover Height
16"

Total Length
68"

Wheelbase
45"

Dropout Width
Front: 135 mm
Rear: 170 mm

Bottom Bracket Shell Width
100 mm
Square Taper Bottom Bracket

Seat Tube Length
14.5"

Top Tube Length (effective)
n/a

Headtube
4.75"

Chainstay
19"

Handlebar Width
660mm (26")

Crank Length
170 mm

Seatpost Diameter
27.2 mm

Max Tire Width
4.25"

Bike Weight
69 lb

Payload Capacity
275 lbs

Folded Dimensions (LxWxH)
42" x 23" x 30"

Sizing
Rad Power Bikes sizing chart

What to Measure


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


This will typically be an inch or two longer than the length of your trousers, but you’ll want to 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:

  1. Medium-width hardcover book
  2. Tape measure
  3. A wall you can stand against
  4. 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.


Display Technology
RadMini Step-Thru Electric Fat Bike Version 2 display
Battery Life
A fuel gauge for your electrons.

Pedal Assist Level
The higher the number, the more the motor will boost you when you pedal.

USB Charging
5V, 1 Amp port to charge your phone or portable electronics on the go.

Odometer
Calculate how many miles you didn't drive this year and how much money you saved on gas.

Speedometer
Can be set to current speed, max speed, or average speed.

Wattmeter
Shows how much power the motor is outputting at any given time.

Rad Battery Pack

The Rad Battery Pack

With over a decade of designing and building ebikes under our belts, we know that a high-capacity battery like this isn’t something you cheap out on. We designed and built our batteries using genuine Samsung 35E cells, which are some of the most energy-dense and reliable lithium-ion cells on the market today. These cells have allowed us to build an overall better battery, and at only 7.7 lbs, it's one of the lightest and most energy-dense packs on any electric bike.

25-45+
Miles per Charge
5-6 Hours
To Fully Charge
672 Wh
Total Battery Capacity

Compact, Discreet, Maintenance-Free Hub Motor

With 750W and 80 Nm of torque at your disposal, this Bafang geared hub motor is what is going to help power you up steep inclines and get you up to top speed quickly from a dead stop, all while remaining quiet and inconspicuous. These kinds of numbers aren't even found on some of the most expensive mid drive systems out there, so prepare to outperform and outclass everyone you see on the road.

750W
Motor Power
80 Nm
Max Motor Torque
 
Hub Motor

Looking for something more traditional?

The RadMini 4 is a great option if you want many of the same features as the RadMini Step-Thru but with a mid step frame.

Explore RadMini