Trystan Casey
Electric bikes are becoming increasingly popular among cyclists. They are a cheaper and greener form of transport, and can increase the distances possible with commuter bikes. However, e-bikes are not cheap. One option is to convert your existing bike by purchasing an e-bike conversion kit. These kits can add an electric boost to your bike at a fraction of the cost of a full e-bike. There are a variety of kits available, such as the Swytch Kit, which comes with everything you need to convert your bike, including a battery, charger, pedal sensor, motor wheel, and more. You can also find kits for under $100 if you get most of your materials for free. However, converting your bike may not save you time or money if you're new to repairing and modifying bikes. Before starting your project, it's important to consider the legal implications and check your state and local laws.
Characteristics and Values of Electric Bike Conversion
| Characteristics | Values |
|---|---|
| Cost | Electric bike conversion kits are a fraction of the cost of a full e-bike. |
| Installation | Conversion kits are straightforward to install, but may require some technical expertise and tools. |
| Performance | Electric bikes offer increased distance, speed, and assistance for riders, making them ideal for commuting and exploring different terrains. |
| Maintenance | Mid-drive conversion systems may have higher maintenance requirements compared to other types. |
| Battery | Conversion kits may or may not include a battery. It is important to consider the battery range and voltage when choosing a kit. |
| Motor | Different types of motors are available, such as front hub-based or mid-drive motors. The motor weight and compatibility with the bike design should be considered. |
| Legal Compliance | It is important to consider state and local laws when converting a bicycle to an electric bike to ensure it complies with regulations. |
| Sensor | Pedal sensors detect when the rider is pedaling and adjust the power output accordingly. |
| Customer Support | Some conversion kits offer good customer support, which can be beneficial for those new to working with bike electrics. |
| Compatibility | Conversion kits are available for a wide range of wheel sizes and bike designs. However, it is important to check compatibility before purchasing. |
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What You'll Learn
Choosing a kit
Electric bike conversion kits are a great way to boost your existing bicycle without the price tag of a full e-bike. Before choosing a kit, it is important to familiarise yourself with the laws regarding e-bikes in your region.
There are several types of e-bike conversion kits available, and the right one for you will depend on your personal requirements and budget. Front-wheel conversion kits are a good option if you want something simple and easy to remove and reinstall. However, they can make the front wheel heavy and affect the handling of the bike. A rear-wheel conversion kit can deliver plenty of power, but the weight of the batteries can be an issue. A mid-drive motor conversion kit is another option, but it can be complex and bulky.
When choosing a kit, consider the power output, range, and journey needs. Select a power output between 250W and 500W for light-use capabilities. The range of your e-bike will depend on the battery size; a 10Ah battery will give you a range of around 18 miles, while an 18Ah battery will provide up to 33 miles.
Some popular e-bike conversion kits include the Swytch Go, which offers a 250W motor and a 378kWh battery with a range of up to 40 miles. The Bafang Front Hub Motor kit is another option, allowing you to choose your wheel size, display preference, battery size, and shape. The TongSheng mid-drive motor is also worth considering, offering compatibility with a wide range of bike designs and high torque for steep hills and off-road terrain.
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Compatibility
Firstly, it is crucial to ensure that the conversion kit is compatible with your bike's frame size, wheel size, and brake type. For instance, the Bafang front hub-based motor kit is only compatible with bikes that have a front disc brake and a quick-release axle. The TongSheng mid-drive motor, on the other hand, is compatible with a wide range of bike designs and offers high torque for steep hills and off-road terrain. If you have a disc brake bike that is a newer, more expensive model, it is worth checking compatibility, as some electric bike conversion kits may not be suitable.
Secondly, the battery voltage and output must match the motor. In addition, the charger must be compatible with the battery to avoid safety hazards. The Swytch eBike Conversion Kit, for example, includes a battery, charger, and other necessary components, ensuring compatibility and ease of installation.
Lastly, consider your range and journey needs. If you live in an area with steep hills, you may require a conversion kit with more top-end power and a higher-capacity battery. For instance, a 100Wh (Watt-Hour) battery will last for one hour when the motor outputs 100 watts of power. A 250-watt motor with a 500Wh battery will last for two hours at full power.
It is important to note that converting your bike may void the manufacturer's warranty. If you are unsure about the compatibility or installation process, it is recommended to seek assistance from a reputable bike shop or a qualified bike mechanic.
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Installation
Electric bike conversion kits can be a great way to upgrade your bike and give it an electric boost. The process of installing an electric bike conversion kit can vary depending on the type of kit and your bike, but here is a general step-by-step guide on how to do it:
Prepare the Bike:
Firstly, you will need to gather the necessary tools and materials. It is important to have some basic bike repair skills and access to the right tools. If you are new to bike repairs, consider seeking guidance from online forums, bike repair guides, or experienced individuals. Before beginning the installation, ensure your bike is in good condition and perform any necessary maintenance or tune-ups.
Choose the Right Kit:
Select a conversion kit that is compatible with your bike. Consider factors such as wheel size, brake type, and axle compatibility. Some popular options include the Swytch Kit, Bafang front hub-based motor, TongSheng mid-drive motor, and Voliamart rear wheel kit.
Install the Motor:
The installation process will depend on the type of kit you choose. For a front-wheel motor, you will need to remove the front wheel and install the new motorised wheel. For a mid-drive motor, you may need to remove the bike's crank to attach the motor to the bike's frame. Ensure you follow the specific instructions provided with your chosen kit.
Attach the Sensors:
Install the cadence or pedal sensors as per the kit's instructions. These sensors detect when you are pedalling and signal the motor to provide assistance. The placement of these sensors is crucial for accurate detection.
Connect the Battery:
Connect the battery to the motor and secure it to the bike frame using a cargo bracket or velcro straps, depending on the kit. Ensure the battery is easily accessible for removal and charging. Some kits may require you to source your own battery, so choose one that matches the voltage and amp hours suitable for your needs.
Finalise the Setup:
Once the motor, sensors, and battery are installed, finalise the setup by connecting the LCD display (if included) and ensuring all cables are securely routed. Test the bike to ensure it functions properly. Adjust the assistance level and power options to your preference.
It is important to note that electric bike conversions may have legal implications, so be sure to check your local laws before riding your converted electric bike on public roads. Additionally, always prioritise your safety and follow recommended practices when working with electrical components and making modifications to your bike.
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Maintenance
Maintaining your electric bike conversion kit is essential to ensure its longevity and optimal performance. Here are some key maintenance tips:
Battery Care
The battery is one of the most critical components of your electric bike conversion. Proper care can extend its lifespan and improve performance. It is recommended to use the charger that comes with the kit as it is designed for the specific battery type. For example, the cheapest option, a sealed lead-acid battery (SLA), should be used with the provided charger to avoid any hardware modifications. Additionally, most sources suggest that an SLA battery will need to be replaced every two years, so budgeting for this expense is important.
Connection Maintenance
It is essential to regularly inspect all electrical connections for any signs of looseness or corrosion. Tight and corrosion-free connections ensure reliable power delivery to the motor and other electrical components.
Display and Controller Issues
If you encounter display issues or unexpected shutdowns, refer to your conversion kit's manual for specific troubleshooting steps related to your particular model. Each kit may have unique procedures to resolve these problems.
Brake Maintenance
Brakes are a critical safety feature on your electric bike. Ensure your brakes are properly adjusted and aligned. If you experience reduced stopping power or spongy brake levers, consider bleeding the brakes to remove air bubbles from the hydraulic system. If issues persist, consult a qualified mechanic, especially if you've recently upgraded your braking system.
Drivetrain Maintenance
The drivetrain, including the chain, cassette, and derailleurs, requires regular maintenance and lubrication. A worn-out drivetrain can lead to difficulty changing gears and noisy shifting. If adjustments don't resolve these issues, consider replacing worn components with the help of a qualified mechanic if needed.
Motor Maintenance
If you experience unusual noises, reduced power output, or a grinding sensation, it could indicate loose motor components or chain tension issues. Consult your conversion kit manual and perform the necessary adjustments. If problems persist, don't hesitate to seek assistance from a qualified e-bike mechanic to diagnose potential internal motor issues.
Legal Compliance
It's important to note that the legal status of your electric bike conversion may vary depending on your location. In some jurisdictions, if your electric bike uses a throttle, it may be classified as a moped, requiring taxation and insurance. Stay informed about the laws and regulations in your area to ensure your conversion complies with all relevant standards.
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Legalities
Electric bike conversion kits are generally legal, but the precise rules vary from country to country, and even within different states or regions. For example, in the UK and EU, a motor must have a maximum power output of 250 watts, while the US allows for more powerful motors. In the UK, you must be aged 14 or over to ride an electric bike, and the same is true in the US.
It is important to understand the legal implications and regulations surrounding electric bike conversions before starting a project. Local laws and regulations should be consulted, as well as the specific classifications of e-bikes in your region. These classifications are often based on factors such as maximum speed and power output, and they determine where e-bikes can be ridden, such as on public roads, bike lanes, or restricted areas.
When choosing a conversion kit, it is essential to select one that complies with local regulations. Some kits may exceed legal power limits or fail to meet safety standards, which could lead to legal consequences or safety hazards. It is the responsibility of the rider to ensure their e-bike conversion complies with local laws and regulations.
In some jurisdictions, e-bikes with throttles are classed as mopeds or motorcycles and must be taxed and insured as such. In the UK, for example, a bike with a throttle must be licensed and taxed if it exceeds the speed limit for electric bikes, which is currently 15.5 mph (25 kph).
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Frequently asked questions
E-bikes can increase the distances possible with commuter bikes and replace a car for running errands around town. They also offer a cheaper and greener form of transport to get you from A to B at a higher pace for less effort than a conventional bike.
Some popular electric bike conversion kits include the Swytch Kit, the Voliamart rear wheel kit, the TongSheng mid-drive motor kit, and the Bafang front hub-based motor kit.
When choosing an electric bike conversion kit, it is important to consider the compatibility of the kit with your bike, the range of the battery, the cost and maintenance requirements of the kit, and your technical expertise.
Converting a bike to an electric bike may require specialized tools and technical knowledge, and it is important to consider the legal implications of the conversion in your area. Additionally, there may be challenges in sourcing the necessary materials and maintaining the quality of the ride.
