2020 Rad Power Bikes

RadMini 4

A 20″ aluminum frame folding e-bike with modest components and mechanical disc brakes.
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MSRP$1,499
Weight67.0 lbs  
FrameAluminum
SuspensionHardtail, 80mm
Wheels20″ Aluminum
Drivetrain1 × 7
GroupsetAltus, Tourney
MotorBafang 750W 80Nm hub-drive
Battery672Wh
BrakesMechanical Disc
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Insights
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

26 mph

RadMini 4

22 mph

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Highest gear

(descending)

Reviews
Electric Bike Review
Rad Power Bikes RadMini 4 Review

May 2020

Price: $1499.00 | Model Year: 2020 | The high-step version of Rad's folding, fat tire, off-road capable, compact electric bike. Custom 3.3

Observations
  • The high-step version of Rad's folding, fat tire, off-road capable, compact electric bike. Custom 3.3" wide tires have reflective sidewalls, puncture resistant lining, and all-terrain checkerboard tread. This is the fourth generation RadMini, and it comes standard with wide plastic fenders, integrated lights, and a spring suspension fork with preload adjust and lockout

  • Only available in one frame size and one color, but the handlebar and seat height are adjustable so it can accommodate a wide range of body types. The folding joint is fairly narrow, so you won't bump your knee, but there are no bottle cage bosses. The frame feels very solid and doesn't suffer from frame flex, it's lighter than the RadMini Step-Thru at 68lbs vs. 69lbs

  • Large 180mm disc brake rotors provide excellent stopping power and control, both brake levers activate the rear light for safety and cut power to the motor. RAD optimized 750 watt Bafang planetary geared hub motor feels powerful but smooth, you can adjust the top speed down from 20mph in the settings menu. Large aluminum alloy folding pedals feel solid, alloy chainring guide keep your pants clean while reducing chain drops

  • Wide 11 to 34 tooth gearing makes it easy to pedal up steep hills and comfortable to maintain ~20mph top assisted speeds without feeling outpaced, large thumb shifter is intuitive but a little difficult to reach compared to triggers. The new twist throttle design feels good and overrides pedal assist at all levels for easy starts and extra power when needed. Full sized 1 amp USB charging port below display, excellent kickstand placement, large selection of racks and accessories that are cross-compatible with other RPB models

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Specs
Build
Frame

6061 aluminum

Tire Clearance4"

Fork

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

Travel80mm

Spring TypeCoil

Bottom Bracket

100 mmSquare Taper Bottom Bracket

Headset

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

Stem

High-rise folding stem with 3" vertical adjustment

Handlebar

Custom formed aluminum, 26" wide, 2.5" rise

Saddle

Velo Plush with lifting handle

Seatpost

Promax, 350 mm x 27.2 mm

TypeRigid

Pedals

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

Grips

Durable imitation leather ergo

Groupset
Rear Derailleur

7-Speed Shimano Altus

Crank

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

Shifters

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

Cassette

DNP 7-speed freewheel, 11-34T

Chain

KMC Z7

Brakes

Tektro Aries (MD-M300)

TypeMechanical Disc

Brake Levers

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

Wheels
Rims

Double wall, 36H

Spokes

12-gauge stainless steel, black

Tires

Rad Power Bikes by Kenda K-Rad 20" x 3.3", K-Shield puncture-resistant liner

Disc Rotors

Tektro 180 mm front and rear

Electric Components
Motor

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

Battery

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

Display

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

Charger

48V, 2 Amp Rad Power Bikes smart charger, operates on both 110V and 230V AC power outlets

Accessories
Lights

Front: Standard Rad Power Bikes LED headlightRear: Integrated taillight with brake light

Fenders

Full coverage front and rear

Racks

Optional

Rider Notes
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Last updated July 21
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