Clean Republic Recalls Hill Topper Electric Bike Motor Controllers Due to Crash and Injury Hazards

What was recalled

If you have been working on a project to transform your standard bicycle into an electric one, or if you recently purchased components for such a conversion, it is important to know exactly which parts are involved in this safety notice. The U.S. Consumer Product Safety Commission (CPSC) issued a recall on August 2, 2018, concerning specific motor controller circuit boards and kits produced by Clean Republic under the Bafang Electric brand. These products were marketed as "Hill Topper Electric Bike Kits," which are designed to allow everyday cyclists to upgrade their existing bikes with electric assistance.

The core of this recall focuses on the motor controller circuit boards themselves, which act as the brain of the electric system by managing power delivery from the battery to the motor. The affected units come in two distinct voltage and wattage configurations: a 24-volt, 250-watt model and a 36-volt, 350-watt model. These specific circuit boards were not always sold as part of a complete kit; they were also available for purchase separately, meaning that even if you did not buy a full conversion kit, you might have acquired just the controller board on its own.

To determine if your hardware is part of this recall, you must look closely at the physical unit. The model numbers are printed directly on the front of the motor control units. You are looking for one of two specific identifiers: KT24WSH-BF08 or KT36WSH-BFZ13504. If your device bears either of these model numbers, it is included in this safety action. The recall encompasses both the standalone circuit boards and the complete Hill Topper Electric Bike Kits that contain these specific boards.

While the provided recall documentation does not specify the exact quantity of units sold or the precise geographic locations where they were distributed across the United States, the scope is defined by these model numbers rather than a limited batch size. These products were intended for consumer use in home-based bicycle conversions. Because these controllers are critical components that dictate how your bike accelerates, verifying your specific model number against the list above is the first and most crucial step in ensuring your safety.

The hazard, explained

At the heart of this recall is a specific failure mode within the electronic brain of certain electric bike conversion kits: the motor controller circuit board. To understand why this is dangerous, it helps to look at how these components normally function versus what goes wrong when they fail. In a properly working Hill Topper Electric Bike Kit, the motor controller acts as a gatekeeper. It receives signals from your throttle or pedal sensor and translates them into power for the electric motor. Under normal conditions, if you are not actively requesting acceleration, the controller keeps the flow of electricity to the motor at zero or a very low idle level, allowing you to ride like a regular bicycle when the battery is depleted.

The critical flaw identified by the Consumer Product Safety Commission (CPSC) involves water intrusion. These particular circuit boards, specifically models KT24WSH-BF08 and KT36WSH-BFZ13504, are not sufficiently sealed against moisture. When rain splashes up from the road, or when you ride through deep puddles, water can seep into the controller’s housing. Once inside, this moisture creates unintended electrical pathways on the circuit board. Instead of remaining an insulator, the wet board becomes a conductor, causing short circuits that confuse the electronic signals.

This confusion leads to what experts call "runaway acceleration." The short circuit tricks the controller into thinking the rider is still pressing the throttle or pedaling hard, even when you have let go. Consequently, the motor receives full power unexpectedly. For a rider traveling at speed, this sudden surge of torque can be violent and disorienting. Your body expects the bike to coast or slow down, but instead, it is suddenly propelled forward with force you did not request. This mismatch between your physical input and the bike’s mechanical response is the primary cause of the crashes reported in this recall.

The physical consequences of this mechanical betrayal are significant. As noted in the incident reports, riders have lost control of their bicycles entirely. When the motor accelerates without warning, it can pull the handlebars out of your grip or throw you off balance at speeds that make recovery impossible. The CPSC has documented six such incidents, including one resulting in physical injury characterized by scrapes and bruises. While those injuries may seem minor on paper, they are the direct result of a sudden loss of stability. In worse-case scenarios, losing control of an electric bike can lead to more severe trauma from falling onto pavement or colliding with other objects, especially since these converted bikes often weigh more than standard bicycles due to the added motor and battery.

It is important to recognize that this hazard is not dependent on high speeds. Even at moderate cycling speeds, a sudden acceleration can cause you to overtake obstacles unexpectedly or lose traction, leading to a fall. The danger lies in the unpredictability; because the acceleration happens without any input from you, there is no time to brace yourself or prepare for the change in momentum. This is why the remedy requires you to stop using the affected units immediately rather than trying to ride them cautiously.

Who is most at risk

The primary group of people at risk in this recall are the owners and riders of Hill Topper Electric Bike Kits that have been converted from standard bicycles using the specific motor controller circuit boards involved in this notice. This hazard does not affect brand-new, factory-built electric bikes from major manufacturers; rather, it targets a niche community of DIY enthusiasts and hobbyists who purchased these kits separately to upgrade their existing pedal bikes. If you bought a complete e-bike from a reputable retailer recently, you are likely safe. However, if you purchased a conversion kit—specifically those containing the model numbers KT24WSH-BF08 or KT36WSH-BFZ13504—and installed it yourself or had a local bike shop install it for you, you fall directly into the affected population.

Within this group of riders, vulnerability increases significantly depending on riding conditions and the rider’s physical ability to react. The core danger here is that the motor can accelerate without any input from the throttle or pedal sensors. This means the bike moves forward unexpectedly, often at speed, while the rider is attempting to brake or steer. For experienced cyclists who are physically fit and possess strong reflexes, there may be a chance to counter-steer or dismount safely if they recognize the malfunction instantly. However, for many riders, this sudden surge of power creates a loss of control that is difficult to overcome with manual braking alone, especially on wet pavement where stopping distances are already extended.

Certain demographics face heightened risks due to physiological and physical factors. Older adults, who make up a significant portion of the e-bike user base for recreational cruising, may have slower reaction times or reduced bone density. A sudden acceleration that leads to a fall can result in severe fractures or head injuries rather than just minor scrapes. Similarly, riders with less upper-body strength might struggle to maintain balance against the torque of an unexpectedly accelerating motor, making them more prone to tipping over. Children and teenagers who have customized their bikes with these kits are also at risk; while they may be agile, they often lack the mature judgment to assess mechanical failures quickly, potentially panicking when the bike behaves erratically.

Furthermore, the context of use matters greatly. Riders who frequently commute in traffic, ride on uneven terrain, or navigate busy sidewalks are at greater risk than those who only ride on smooth, empty trails. In these complex environments, a sudden lurch can cause a rider to swerve into the path of vehicles, pedestrians, or obstacles. The reported incidents in this recall involved riders losing control entirely, leading to falls that resulted in scrapes and bruises. For anyone relying on their bike for daily transportation or who rides in mixed-traffic environments, the unpredictability introduced by a faulty motor controller transforms a routine ride into a potentially life-threatening situation. If you fit any of these descriptions—especially if you are older, less agile, or ride in high-traffic areas—it is critical to treat this recall with immediate urgency.

How to tell if you have the recalled item

If you have recently converted a standard bicycle into an electric bike using a kit from Clean Republic’s Hill Topper line, or if you purchased replacement components for such a system, it is crucial to verify whether your equipment is part of this specific recall. The primary concern lies within the motor controller circuit boards, which are the electronic heart of these conversion kits. Because these components can be sold both as standalone parts and as integrated pieces of a larger kit, identifying the exact model requires careful attention to detail. You should not rely solely on the packaging or a general description of your bike; instead, you must physically inspect the hardware itself.

The most reliable way to confirm if you own a recalled unit is to locate the motor control unit on your bicycle. This component is typically housed in a small, protective casing and is connected to the motor hub and battery. Look closely at the front face of this unit. The recall specifically targets two model numbers: KT24WSH-BF08 and KT36WSH-BFZ13504. These alphanumeric codes are printed directly on the front of the motor control units. If you see either of these specific identifiers, your equipment is included in this safety action. It is important to note that these models correspond to two different power configurations: the KT24WSH-BF08 is a 24-volt, 250-watt board, while the KT36WSH-BFZ13504 is a 36-volt, 350-watt board. Both versions are affected by this recall due to the same underlying vulnerability regarding water intrusion.

While the brand name "Bafang Electric" is associated with the technology used in these controllers, the recall is issued by Clean Republic under their Hill Topper product line. Therefore, you should also look for any branding or labeling that indicates the kit was sold as a "Hill Topper Electric Bike Kit." These kits were designed to convert regular bicycles into electric ones, so if your bike has been retrofitted with such a system, there is a possibility it contains the recalled circuit board. The units may have been sold separately or as part of a complete package, so the presence of other non-recalled components does not guarantee your controller is safe.

If you cannot find the model number on the front of the unit, check any documentation that came with your purchase, such as user manuals, warranty cards, or order confirmations from www.electric-bike-kit.com. However, the physical inspection of the controller itself remains the definitive method. If you are unsure whether your specific board matches one of the two recalled models, it is safest to assume it might be included and contact the manufacturer for verification. Do not attempt to open the casing or modify the unit yourself, as this could void any remedy and potentially create additional electrical hazards.

To help you verify your device quickly, here is a checklist for identification:

• Check the Front Face: Look directly at the front of the motor control unit attached to your bike frame or wheel assembly.
• Identify the Model Number: Confirm if the printed code is exactly KT24WSH-BF08 or KT36WSH-BFZ13504.
• Verify the Voltage/Wattage: Ensure the board matches one of these specifications: 24V/250W or 36V/350W.
• Confirm the Source: Determine if the kit was sold by Clean Republic as a Hill Topper product, either as a standalone controller or part of a full conversion kit.

If you find that your motor controller matches these criteria, please stop using it immediately. The risk of water entering the controller and causing unintended acceleration is serious. Do not ride the bike until you have contacted Hill Topper to arrange for a free replacement. Your safety depends on accurate identification, so take the time to inspect the hardware carefully before proceeding with any next steps.

What to do — step by step

Your refund, repair, or replacement options

If you have identified that your electric bike kit contains one of the recalled Hill Topper motor controller circuit boards, the good news is that the remedy for this issue is straightforward and completely free. The company, Clean Republic, which markets these Bafang Electric components under the Hill Topper brand, has committed to replacing the defective parts entirely. You do not need to pay for shipping, nor do you need to purchase a new controller from a third-party vendor. This is a full replacement program designed to ensure your ride remains safe without placing any financial burden on you.

To get started with this process, you will need to reach out to the company directly through one of their designated support channels. You can call their toll-free number at 855-743-3279. It is important to note their hours of operation: they are available Monday through Friday from 8 a.m. to 3 p.m. Pacific Time. If you prefer written communication or need to send documentation, you can email them at support@ukko.io. Alternatively, the most efficient method may be to visit their website at www.electric-bike-kit.com and navigate specifically to the "Recall Information" section. This online portal is likely set up to handle the volume of requests efficiently and may provide specific instructions or forms tailored to this recall.

When you contact them, have your unit ready. Specifically, look for the model numbers KT24WSH-BF08 or KT36WSH-BFZ13504 on the front of the motor control unit. Confirming these details will help the support team verify that your item is indeed part of this specific recall batch. The remedy provided is a free replacement motor controller circuit board. This applies whether you purchased the board separately or as part of a complete Hill Topper Electric Bike Kit. The goal is to swap out the component that allows water to enter and cause unintended acceleration with one that does not have this flaw.

While waiting for your replacement, please remember that you should immediately stop using the recalled motor controller circuit boards and kits. Do not wait for the new part to arrive before ceasing use. The risk of the motor accelerating on its own due to water intrusion is real and has already resulted in injuries. By stopping use now, you protect yourself until the safe replacement arrives and is installed. Once you receive the free board, follow any installation instructions provided carefully to ensure your electric bike is restored to a safe operating condition.

What can happen if you ignore it

When you choose to keep using a recalled motor controller, you are essentially betting your physical safety on the hope that a known engineering flaw will not trigger at an inconvenient or dangerous moment. The core issue here is not merely inconvenience; it is a fundamental failure of control. The recalled Hill Topper Electric Bike Motor Controllers from Clean Republic (under the Bafang Electric brand) have a specific vulnerability: water can penetrate the unit and cause the motor to accelerate without any input from you. This is not a minor glitch where the bike slows down unexpectedly. It is an uncommanded surge of power. If you ignore the recall, you are leaving that vulnerability active in your daily routine.

The reality of this hazard is best understood by looking at what has already happened to others. The manufacturer has documented six separate incidents where riders lost control of their bicycles because the motor accelerated on its own. While six reports may sound like a small number, each one represents a person who was suddenly thrust into a dangerous situation without warning. One of these incidents resulted in physical injury, specifically scrapes and bruises to the rider. These are not abstract statistics; they are real-world outcomes of ignoring a known electrical fault. When a bike accelerates unexpectedly, especially at higher speeds or on uneven terrain, the rider’s natural reaction is often panic or confusion. This split-second delay in processing what is happening can mean the difference between recovering balance and being thrown from the saddle.

Continuing to use this equipment also exposes you to risks that extend beyond just falling off your bike. An uncommanded acceleration can cause you to swerve into traffic, collide with pedestrians, or lose control on hills where braking distance is critical. The motor controllers in question come in two variants: the 24V/250W model (KT24WSH-BF08) and the 36V/350W model (KT36WSH-BFZ13504). Regardless of which version you have, the underlying issue remains the same. Water ingress is not a one-time event; it is an ongoing risk every time you ride in rain, through puddles, or even during high humidity. Each exposure increases the likelihood that the internal circuitry will fail again.

Furthermore, ignoring the recall means you are denying yourself the free replacement that Clean Republic is offering to fix this problem. The remedy is straightforward and cost-free: a new motor controller circuit board that does not have this water penetration flaw. By doing nothing, you are choosing to maintain a defective product when a safe alternative is available. The potential consequences of ignoring this recall are not just theoretical; they are documented in injury reports and lost control incidents. Your safety depends on recognizing that an electric bike is a vehicle that requires reliable throttle response, and a unit that accelerates on its own fails that basic requirement of safety.

Staying safe: broader tips

While specific product recalls are essential for addressing known defects after they have been identified, true safety often comes from proactive habits and a general awareness of how technology interacts with our daily lives. When it comes to electric bicycles and similar personal mobility devices, the line between convenience and risk can sometimes blur if we rely too heavily on automated systems without understanding their limitations. One of the most effective ways to stay safe is to treat your e-bike not just as a vehicle, but as a complex electronic system that requires regular maintenance and situational awareness. Unlike traditional bicycles, which are largely mechanical, electric bikes introduce electrical components like motors, batteries, and controllers that can fail in unpredictable ways. Therefore, developing a routine of inspecting these components before every ride is crucial. Look for signs of wear on wiring, ensure all connections are tight, and verify that your braking system responds immediately to lever pressure. These simple checks can often identify potential issues before they become dangerous incidents.

Another critical aspect of staying safe with any electronic device exposed to the elements is understanding environmental risks. Water intrusion, for example, is a common culprit in electrical failures across many consumer products, from outdoor power tools to garden equipment. It is wise to follow manufacturer guidelines regarding weather conditions and storage. If your device is not explicitly rated for heavy rain or submersion, avoid exposing it to such conditions whenever possible. After riding in wet conditions, allow the device to dry thoroughly before charging or storing it, as moisture can linger in hard-to-reach areas and cause corrosion or short circuits over time. This principle extends beyond e-bikes; it applies to any outdoor power equipment you own. Keeping your gear dry and clean is one of the simplest yet most effective ways to extend its lifespan and maintain its safety.

Beyond physical maintenance, staying informed about product safety is an ongoing responsibility. The U.S. Consumer Product Safety Commission (CPSC) maintains a comprehensive database of recalls that covers thousands of products, from children’s toys to home appliances. Subscribing to recall alerts or periodically checking the CPSC website can help you stay ahead of potential hazards. Additionally, registering your products with the manufacturer after purchase ensures that you will be notified directly if a safety issue arises. This step is often overlooked but can be invaluable in ensuring you receive timely information about remedies or updates. By combining regular physical inspections with proactive information gathering, you create a robust layer of protection that goes beyond what any single recall notice can provide.

• Read and follow all manufacturer instructions for use, maintenance, and storage.
• Regularly inspect electrical connections and wiring for damage or wear.
• Avoid exposing electronic devices to extreme weather conditions unless they are specifically designed for it.
• Register your products with manufacturers to receive direct safety notifications.
• Periodically check the CPSC website for updates on product recalls relevant to your household.