The RadRunner’s success has led Rad Power Bikes to expand it into a full lineup, and sitting at the top is the new RadRunner Max, their most technologically advanced and powerful utility ebike yet. Packed with first-ever features for Rad like a rear radar system, a 90 Nm motor pushing it to Class 3 speeds, and dual-battery capability, the ‘Max’ designation is well-earned. But with a premium price tag of $2,299, the question is: do these high-tech additions justify the cost and make it the definitive RadRunner?
This review will take a deep dive into the RadRunner Max. We will test its real-world performance, scrutinize its new features, and see how it stacks up against its more affordable siblings. By the end, you’ll have a clear picture of its capabilities and be able to decide if this is the right utility ebike for you.
(If you’ve found this review helpful, you can support our work by using our affiliate link before you buy from Rad Power Bikes. It’s free for you and helps us make more reviews like this one!)
RadRunner Max YouTube Review: See It In Action
To see how the RadRunner Max’s new features like the rear radar and torque sensor perform in the real world, check out our complete video review. We go in-depth with a full walk-around, test the bike’s Class 3 speed capabilities, and see how its high-torque motor handles our hill climb challenge.
What Makes the RadRunner “Max”?
The “Max” in the name isn’t just for show, it represents a big leap forward in technology and performance for the RadRunner platform. The following core upgrades are what set it apart from its siblings.
Upgraded Performance: Class 3 Speeds and a Torque Sensor
This is the fastest and most responsive RadRunner to date. The high-torque 750W motor delivers 90 Nm of torque, allowing you to reach speeds of up to 28 mph with pedal assist. The system now uses a torque sensor, which provides smooth, intuitive power that directly matches how hard you’re pedaling. This creates a much more natural and responsive-feeling ride compared to the cadence-based systems on the other RadRunner models.
Enhanced Safety with Rear Radar and Advanced Lighting
To improve visibility, the upgraded headlight is significantly brighter and now includes a high-beam function for darker roads, while the rear light integrates both a brake light and bright turn signals. The RadRunner Max also introduces a rear radar system that actively detects vehicles approaching from behind up to 100 meters away, displaying their relative speed and distance on the screen. The addition of turn signals and the rear radar are welcome safety upgrades not found on other RadRunner models. While the radar is no substitute for a mirror, it performs its job reliably, adding an extra layer of on-road awareness.
Extended Range and Smart Security Features
This is Rad’s first ebike designed to accommodate a dual-battery setup. With the optional Range Extender battery, the bike’s potential travel distance can be pushed to over 100 miles on a single charge. For security and convenience, the bike is also equipped with modern tech upgrades, including Apple Find My integration for tracking, RFID key tags for quick startup, and the ability to unlock the bike via Bluetooth with your phone.
Frame Design and Utility
The RadRunner Max is built on a proven low-step frame that’s incredibly easy to hop on, a practical design choice that enhances its daily usability. The ride quality is a significant step up from other models, with a plush 80mm suspension fork and wide, puncture-resistant 20″ tires soaking up bumps with ease and providing a confident, stable feel. Utility is central to its design, from the high payload capacity and robust rear rack to the incredibly stable dual-leg kickstand that makes loading cargo or passengers a breeze. For families, the new ‘Caboose’ accessory adds a secure wrap-around railing for older kids, though the rack is not compatible with Thule child seats.
Sizing and Fit
Rad Power Bikes designed the RadRunner Max with a one-size-fits-most approach, aiming to comfortably accommodate riders from 4’11” all the way up to 6’2″. This wide range is made possible by the highly adjustable BMX-style handlebars, which can be moved closer or further away to dial in the perfect reach, and a saddle that allows for a relaxed, upright riding position.
Below are the key geometry and dimensions that define the RadRunner Max’s fit.
Specs and Components
The RadRunner Max is equipped with a host of upgraded components that contribute to its performance and utility. From the high-torque motor and responsive electronics to the reliable 8-speed drivetrain and hydraulic brakes, the build is a significant step up in the RadRunner lineup.
Below is a detailed breakdown of the key technical specifications.
RadRunner Max Performance Review
This section breaks down how the RadRunner Max performs in key real-world scenarios. We tested its 750W motor with 90 Nm of torque, its new torque sensor-based assist system, and its unique rear radar to see how the bike handles everything from accelerating from a stop to climbing steep hills and navigating traffic.
Throttle-Only Acceleration | RadRunner Max Review
The right-hand half-twist throttle gives you access to the motor’s full power on demand, even from a complete stop. It provides a smooth, gradual acceleration up to the 20 mph throttle speed limit, which is great for getting a heavy load moving or for when you just want to cruise. One of the best aspects of the twist throttle is how easy it is to modulate; you can feather it to maintain lower speeds without having to go full power all the time. (Note: On our test model, we noticed a slight stutter when using only the throttle. We are in contact with Rad Power Bikes to diagnose the issue and will update the review with any findings).
Riding with Pedal Assist and a Torque Sensor
The addition of a torque sensor is the single biggest upgrade to the riding experience on the RadRunner Max. Unlike a cadence sensor that simply turns on when you pedal, the torque sensor measures how hard you’re pedaling and delivers a proportional amount of power. The result is a ride that feels intuitive and natural. Pushing harder on the pedals rewards you with an instant surge of power, and easing up provides a more gentle assist.
- PAS 1-2: The lower assist levels are perfect for relaxed cruising. The bike provides a gentle push, making it easy to maintain speeds in the low teens while still getting some exercise.
- PAS 3-5: In the higher levels, the bike really comes alive. The 750W motor delivers substantial power, making it easy to get up into the mid-20s. Pushing to the Class 3 top speed of 28 mph requires a bit more effort from the rider, but it’s easily achievable and feels stable, transforming the bike into a capable commuter that can keep up with city traffic.
Rear Radar System in Action
The bike’s most unique tech feature is the rear radar, which detects vehicles approaching from behind. When a car is detected, a bright yellow alert appears on the display, showing the vehicle’s relative speed and a bar that indicates how close it is. In our testing, the system worked flawlessly for cars directly approaching in a bike lane, providing a useful, attention-grabbing heads-up. It’s a great secondary safety feature, but it’s not a replacement for a mirror or situational awareness. In busy traffic with cars on all sides, it can sometimes register false positives, but for its intended purpose of alerting you to overtaking vehicles, it’s an impressive and welcome addition.
Hill Climb Test | RadRunner Max Review
The RadRunner Max’s impressive motor and high torque rating were on full display during our hill climb test.
- Throttle Only: Using just the throttle, the bike was able to power up our steep test hill while maintaining an impressive minimum speed of 16 mph. This is excellent performance for a hub motor and shows it has plenty of power for tackling inclines without any pedal input.
- With Pedal Assist: Using the torque sensor makes climbing hills feel effortless. By selecting a higher pedal assist level and a lower gear, you can easily spin up the hill at a comfortable pace. If you want more speed, putting more power into the pedals prompts the motor to deliver its full 750 watts, allowing you to surge up the hill much faster than you could with throttle alone.
Accessorizing the RadRunner Max: Cost and Key Upgrades
One of the greatest strengths of the RadRunner platform is the vast ecosystem of accessories that allows you to tailor the bike to your specific needs. As noted in the video review, the fully equipped build we tested came in at just under $3,400. This total reflects a setup designed for maximum range and family utility. Here’s a breakdown of the key accessories that get you there.
Range Extender and Second Battery ($249 for housing, approx. $499 for 14Ah battery)
To truly max out the range, you need both the housing unit that mounts to the frame and a second 14 Ah battery. This effectively doubles your potential travel distance, turning the RadRunner Max into a serious long-distance hauler. It is also compatible with their 15Ah safe shield battery ($599).
RadRunner Caboose ($199)
This sturdy, wrap-around frame creates a secure and protected space for an older child to ride on the back. It features a padded backrest and a retractable entry bar, making it easy for kids to get on and off safely.
Passenger Kit ($139)
This is a required accessory to be used with the Caboose. It includes the padded rear passenger seat, retractable footpegs, and clear protective wheel skirts to keep small feet safely away from the rear wheel.
Total Cost as Tested:
As seen in our video review, the investment for our fully equipped RadRunner Max is $3,385, calculated as follows:
- RadRunner Max Base Price: $2,299
- Second 14Ah Battery: $499
- Range Extender Housing: $249
- RadRunner Caboose: $199
- Passenger Kit: $139
- Total: $3,385
(Note: Prices are subject to change and are based on pricing at the time of this review.)
RadRunner vs. Plus vs. Max: A Comparison
While they share a name, it’s important to understand that each RadRunner model is built on a slightly different frame with its own unique payload capacity and feature set. The differences go beyond simple component upgrades; they create three distinct riding experiences for different needs and budgets. From the kickstand type to the inclusion of gears, suspension, and advanced electronics, each model is its own complete package.
RadRunner (2025): The No-Fuss Workhorse
The standard RadRunner is the most straightforward and affordable model in the lineup. It’s built for simplicity with a single-speed drivetrain, meaning you never have to think about shifting gears. It’s a dependable utility ebike with a rigid fork, a 60 Nm motor, and a respectable payload capacity, making it a great blank canvas for customization.
- Who is it for? The RadRunner is ideal for riders in mostly flat areas who value a low-maintenance, budget-friendly ebike for errands and casual trips. Learn more with our standard RadRunner YouTube review.
RadRunner Plus (2025): The All-Inclusive Comfort Cruiser
The RadRunner Plus hits the sweet spot for comfort and versatility right out of the box. It shares the same 60 Nm motor performance as the base model but adds crucial upgrades that transform the ride. The biggest additions are the 7-speed Shimano drivetrain for tackling hills and a front suspension fork that smooths out bumpy roads. It also comes standard with full fenders and the complete passenger kit (rear seat, footpegs, and wheel skirt), making it instantly ready for family adventures.
- Who is it for? This is the perfect choice for families or anyone wanting a do-it-all utility bike without the need to buy and install major accessories. It’s for the rider who wants to carry a passenger, tackle varied terrain, and enjoy a more comfortable ride. Learn more with our in-depth RadRunner Plus (2025) article.
RadRunner Max: The High-Performance Tech Leader
The RadRunner Max is for the rider who wants the best performance and the latest technology. The headline upgrade is its Class 3 capability, allowing it to reach speeds up to 28 mph. This is powered by a much stronger motor with 90 Nm of torque and a more intuitive torque sensor. The tech is also a major step up, with a more robust 8-speed drivetrain, a better suspension fork, a much brighter headlight, and the innovative rear radar system for added safety. It also features the largest battery and is the only model that can be upgraded with a second battery for maximum range.
- Who is it for? The Max is for the serious commuter, the tech enthusiast, or the rider who needs maximum power and payload capacity for heavy-duty tasks. If you want to get where you’re going faster and value cutting-edge safety features, the Max is in a class of its own.
The Rad Power Bikes Buying Experience
While Rad Power Bikes is making a significant effort to grow its network of local bike shop partners, most customers will still purchase their ebike directly from the company’s website. Rad pioneered this direct-to-consumer model, and it remains their primary sales channel. In addition to their expanding dealer network, Rad also operates its own physical retail stores in several cities, giving some customers the chance to see a bike in person and take a test ride.
If you buy online, the bike will arrive at your door mostly assembled. You can expect to perform some light final assembly, which typically involves attaching the handlebars, front wheel, and pedals. Rad provides a straightforward quick-start guide and includes the necessary tools to complete the job. For additional help and community tips, the official Rad Owners Forum is an invaluable resource with a very active and helpful user base.
Pros and Cons of the RadRunner Max
After extensive real-world testing, here is our summary of the bike’s key strengths and weaknesses.
The Verdict: Is the RadRunner Max Worth It?
The RadRunner Max is unquestionably the most advanced RadRunner yet. Rad has successfully integrated the features enthusiasts have been asking for—Class 3 speeds, a responsive torque sensor, and a dual-battery option—into the platform’s fun and accessible design. The result is a capable and versatile ebike that elevates the series into a new performance category, with innovative tech like the rear radar system setting it even further apart. It retains the playful character of the original but transforms it into a seriously capable machine.
While the premium price puts it out of reach for budget-conscious buyers, the RadRunner Max carves out a clear niche. It’s a fun, functional, and high-performance package from one of the most trusted names in the industry. For the right rider, the RadRunner Max delivers a premium experience.
If you’ve found this review helpful, you can support our work by using our affiliate link before you buy from Rad Power Bikes. It’s free for you and helps us make more reviews like this one!
