![]() The 20-inch wheels keep the bike low and stable, while the high-volume tires provide cushioning for poor road conditions. The suspension fork, small wheel and wide tire combination is becoming increasingly popular among cargo e-bikes and I'm a big fan. The chainring has a bash guard to protect it from damage and also helps protect the bottom bracket area of the bike. The 11-34 cassette paired with a 48T front chainring gave me plenty of gear for the flats, and I only needed the 34 in the rear a couple of times. The RadRunner was specced well with a seven-speed Shimano drivetrain providing more than enough range. The motor provided plenty of torque and handled the steep grades well. ![]() At 75 lbs, the bike is undoubtedly hefty and only gets heavier when you add panniers and cargo, but I was pleasantly surprised at how well it performed on steep climbs. I live in Durango, Colorado, and took the RadRunner 3 Plus on some pretty steep hills to test how it would climb. The LCD screen is also where you can power up or down the whole bike and control the integrated lights. One can adjust the pedal-assist level using the buttons and LCD screen on the left side of the handlebars. The throttle is not limited by the pedal assist level you choose, so it always provides maximum acceleration. I was initially skeptical of the throttle but found it handy for getting going at stop signs and red lights. It provides enough assistance to bring the RadRunner up to the speed, but you still felt like you're pedaling without being overwhelmed by the motor. The acceleration is quick and I did observe some added noise at level 5. There are five levels of pedal-assist ranging from the first level, which provides very little assistance, to level five, where you are at the max speed of 20mph with minimal pedaling effort. For safety, the motor is automatically cut if the brakes are applied. The RadRunner has both a pedal assist and a throttle. The RadRunner 3 Plus utilizes a hub-driven 750-watt motor system.
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