Building A Super-Fast Electric Bike: 50 Mph And Beyond

Electric bikes, or e-bikes, have become increasingly popular for their eco-friendliness and efficiency. Building a 50 mph e-bike is a complex project that requires careful planning and knowledge of mechanical and electronic components. It is essential to select a strong and durable frame, preferably made from steel or aluminium, that can withstand high speeds. A high-power electric motor is also necessary, with motors in the 1000W to 5000W range offering the greatest potential for speed. Before beginning this project, it is important to consider the significant investment required, the technical skill needed, and the importance of adhering to safety standards.

Choosing a bike frame

When choosing a frame for your 50 mph electric bike, there are several factors to consider. Firstly, decide whether you want to convert a mountain bike or a road bike into an electric bike. Mountain bikes offer more stability due to their wider wheels and heavier frames, which is crucial when riding at high speeds. They also typically have suspension systems, which can help absorb shocks and provide a smoother ride, although this may come at the cost of efficiency due to the added weight. On the other hand, road bikes are generally lighter and more efficient, but they lack suspension, which can make for a bumpy and uncomfortable ride at high speeds.

The type of motor you plan to use will also influence your choice of frame. Consider the size and power of the motor, as well as how you want it to be integrated into the bike. Some motors are designed to supplement pedalling, while others can drive the bike independently. If you plan to use a larger, more powerful motor, a mountain bike frame with its heavier construction may be a better choice.

The intended use of your electric bike will also play a role in your frame selection. If you plan to ride on rough terrain, a mountain bike frame with suspension will provide a more comfortable and controlled ride. Look for durable frames and robust suspension systems that can absorb shocks and vibrations, ensuring a smooth ride even on the roughest trails. On the other hand, if you intend to use your electric bike primarily for commuting or riding on paved surfaces, a road bike frame may be more efficient and manoeuvrable.

Additionally, consider the weight and material of the frame. A lighter frame will make the bike easier to handle and improve its overall efficiency. However, a heavier frame may be necessary to accommodate a larger motor or battery and to provide the required stability at high speeds. Keep in mind that building a 50 mph electric bike is a complex project that requires technical skill and attention to safety standards. Always conduct comprehensive testing after assembling your bike to ensure it functions correctly and safely.

Picking a motor

Type of Bike:

Firstly, decide on the type of bike you want to convert – a mountain bike or a road bike. Mountain bikes offer more stability due to their wider wheels and heavier frames. They usually have suspension systems that provide a smoother ride, especially at higher speeds. On the other hand, road bikes typically lack suspension, which can make for a bumpier ride at faster speeds.

Motor Size:

The size of the motor will depend on your desired speed and how much pedaling you want to do. For a 50 mph speed, you will likely need a larger, more powerful motor. Keep in mind that a more powerful motor will also increase the weight of the bike, so strike a balance between power and portability.

Technical Knowledge:

Consider your technical expertise when choosing a motor. Some motors may require more complex installations and wiring, so opt for a motor that aligns with your skill level or be prepared to learn as you go.

Budget:

Electric bike motors vary in price, and you generally get what you pay for. More expensive motors tend to be lighter, more efficient, and offer better performance. Decide on a budget that works for you, keeping in mind that a higher-quality motor may provide a better overall experience.

Compatibility:

Ensure that the motor you choose is compatible with your bike's frame and wheel size. Check the specifications of the motor to ensure it can be mounted securely and safely. Additionally, consider the weight capacity of your bike frame to ensure it can handle the additional weight of the motor.

Throttle and Pedal Assist:

Decide if you want a throttle-controlled motor, pedal assist, or a combination of both. Throttle-controlled motors allow you to ride without pedaling, like a motorcycle. Pedal assist systems provide a boost to your pedaling, making it easier to achieve higher speeds. Choose a motor that offers the level of assistance you desire.

In summary, when picking a motor for your 50 mph electric bike, consider the type of bike, motor size, your technical knowledge, budget, compatibility, and the level of assistance you want. Remember to prioritize safety and follow local regulations when building your high-performance electric bike.

Parts assembly

To build a 50 mph electric bike, you will need to carefully select and assemble the various parts. Here is a step-by-step guide for the parts assembly:

Step 1: Choosing the Right Bike

Start by selecting a suitable bicycle as the base for your electric bike conversion. You can choose between a mountain bike and a road bike. Consider factors such as where you will be riding, the desired motor size, and how much pedaling you intend to do. Mountain bikes offer more stability due to their wider wheels and heavier frames, while road bikes tend to lack suspension systems, which can make for a bumpy ride at high speeds.

Step 2: Selecting a Strong and Durable Frame

Opt for a sturdy frame that can withstand the increased stress of higher speeds. The frame should be made from materials like steel or aluminum to provide maximum rigidity and safety. Ensure the frame is designed for high-speed applications and can handle the additional weight of the motor and battery.

Step 3: High-Power Electric Motor

Choose a high-power electric motor to achieve your desired speed. Look for motors in the 1000W to 5000W range. The higher the wattage, the faster your electric bike is likely to go. This motor will either supplement your pedaling or drive the bike entirely, like an electric motorcycle with pedals.

Step 4: Heavy-Duty Components

Invest in heavier-grade components to ensure safety and reliability at high speeds. This includes items such as 16-inch moped rims and tires (equivalent to 20-inch bike rims), disk brakes for quick and efficient stopping power, and a full suspension system for a smoother ride.

Step 5: Battery and Electronics

Select a battery that can provide sufficient power to your high-wattage motor. You may also need to invest in a battery management system to ensure efficient charging and discharging. Additionally, consider adding a throttle to control your motor's power output.

Step 6: Final Assembly and Testing

Once you have assembled all the parts, conduct comprehensive testing in a safe environment. Wear appropriate protective gear, including a helmet and pads, during the testing phase and when riding your high-speed electric bike. Adjust the bike as needed to ensure optimal performance and safety.

Building a 50 mph electric bike is a complex project that requires technical skill, attention to detail, and a focus on safety. Always prioritize your well-being when working with high-speed vehicles.

Testing and safety

Firstly, understand the features and operations specific to your electric bike model. Electric bikes have varying engagement mechanisms for their motors. Some common methods include turning on the bike, pedalling, pressing a throttle button, or a combination of these actions. Familiarize yourself with your bike's specific functions to prevent unintended motor activation, which could lead to accidents, especially during cornering or on slippery roads.

Before riding your electric bike, perform a basic safety check. Start by checking your tire pressure and ensure it matches the recommended pressure on the sidewheel. Add air if necessary, as bicycle tires gradually lose air over time due to the slight porosity of rubber inner tubes. Next, test your brakes by squeezing each brake lever while rolling the bike forward and backward. Confirm that the brakes engage smoothly and bring the bike to a stop before the lever reaches the handlebar. Additionally, inspect the wheels to ensure they are firmly attached to the bicycle frame and fork. Check the axle nuts, quick-release lever, or thru-axle, depending on your model, to guarantee a secure connection.

Regular maintenance and adjustments are essential to keeping your electric bike in optimal condition. While complex repairs may require a bike shop's expertise, basic safety checks and maintenance can be performed by the owner. Stay vigilant about periodically adding air to your tires, as mentioned earlier, and keep all components, including the brakes, wheels, and motor, in good working order.

Always wear a helmet when riding your electric bike. Helmet use is a fundamental safety precaution that can significantly impact your well-being in the event of an accident. Many states have laws mandating helmet use, depending on the rider's age and the type of electric bike. Opt for a modern bicycle helmet, which offers improved ventilation, comfort, and lightweight design. Additionally, consider investing in a MIPS helmet (Multi-directional Impact Protection System) to mitigate rotational forces during a collision.

Finally, be cautious when carrying passengers on your electric bike. Only consider doing so if your bike is specifically designed for two people and equipped with the necessary safety features. Tandem bikes and cargo bikes with designated passenger seats are purpose-built for carrying multiple people. Riding with a passenger on a bike not intended for such use can be hazardous and should be avoided.

Riding gear

When it comes to riding gear for your 50 mph electric bike, there are several key considerations to keep in mind to ensure your safety and comfort.

Helmet: A helmet is an essential piece of safety gear for any cyclist, and it is crucial to choose one that fits properly and meets the required safety standards. Opt for a helmet that has a sturdy shell and a secure fastening mechanism to protect your head in the event of a fall or collision.

Protective Clothing: Invest in high-quality protective clothing, including a durable jacket, long pants, gloves, and sturdy footwear. These items should be made from breathable yet durable materials that can provide protection from the elements, debris, and potential road rash in the event of an accident. Look for reinforced elbows, shoulders, and knees in jackets and pants, as well as reflective details that improve your visibility to other motorists.

Eye Protection: Shield your eyes from wind, debris, and insects by wearing a pair of wrap-around sunglasses or goggles. Ensure they fit snugly and provide adequate coverage to protect your eyes from potential hazards at high speeds.

Communication Devices: Consider investing in a communication device, such as a Bluetooth headset, to stay connected while riding. This will enable you to make and receive calls, listen to music, and potentially communicate with other riders, all while keeping your hands on the handlebars and your focus on the road.

Backpack or Storage: If you plan on using your electric bike for commuting or running errands, consider investing in a comfortable backpack designed for cyclists. Alternatively, you can add storage solutions to your bike, such as a front basket or a rear rack with panniers, to carry your belongings securely.

Remember, when riding at high speeds, it is crucial to prioritize safety and ensure that your gear meets the relevant safety standards and provides the necessary protection.

Frequently asked questions