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What are e-bike torque arms and do you need them?

Views: 159     Author: Site Editor     Publish Time: 2023-07-21      Origin: Site


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Electric bikes, or e-bikes, have gained immense popularity in recent years due to their eco-friendliness and convenience. However, it's important to note that safety should always be a top priority when using an e-bike. Many people have their own bikes and then choose to convert them with an e-bike conversion kit, which can be much cheaper than buying an e-bike outright. The technology available for e-bike conversion kits is very sophisticated and this is a great option. However, the design of the original bike does not include a huge hub motor and the bolts and frame of the bike may not be able to cope with the weight and torque of the hub motor. This is where the e-bike torque arms come into play. This article will focus on the essential safety component of e-bike torque arms and why they are important for your e-bike's performance and safety.

What are e-bike torque arms

Explain what torque arms are and what they do

Torque arms are metal components that attach to the hub motor of an electric bike and provide additional support to prevent the axle from spinning out of the dropout. They act as a safety mechanism to prevent damage to the motor, wheel, and frame caused by the rotational forces generated by the motor. Essentially, torque arms help distribute the motor's power evenly to the wheel and keep the bike stable while in motion, thereby improving the overall safety and performance of the e-bike.

Discuss the various types of torque arms available in the market

There are several types of torque arms available in the market, each designed to fit specific types of electric bikes. Here are some of the most common types:

- Single-sided torque arms: These torque arms are designed for single-speed hub motors and attach to only one side of the bike's dropouts.

- Double-sided torque arms: These are suitable for geared hub motors and attach to both sides of the dropouts for added stability.

- Grin Tech torque arms: These are high-quality torque arms designed for heavy-duty use and provide excellent support for the motor and the frame.

- Custom torque arms: Some bike enthusiasts create custom torque arms that fit their specific bike models.

Explain the installation process and any technical details involved

The installation process of torque arms can vary depending on the specific type of torque arm and the bike model. However, here are some general steps to follow:

1. Locate the dropouts on the rear wheel of your bike where the motor attaches.

2. Remove the nuts and washers from the dropouts.

3. Slide the torque arm onto the axle of the motor, ensuring it fits securely against the dropouts.

4. Reattach the washers and nuts and tighten them securely.

5. Verify that the torque arm is properly aligned with the dropouts and that there is no wiggle room.

6. Double-check that the nuts and bolts are tightened to the manufacturer's recommended torque.

7. Test the bike's functionality by taking it for a short ride, making sure that there are no unusual noises or vibrations coming from the motor.

It's important to note that the installation process can be technical and requires precision. If you're not comfortable with DIY work or don't have experience working with ebikes, it's best to seek assistance from a professional. A poorly installed torque arm can cause more harm than good, so it's always better to be safe than sorry.

ebike kit

Do you Need Torque Arms for your E-bike?

Torque arms play a critical role in ensuring the safety and stability of electric bikes. They provide an additional layer of support to prevent the motor axle from spinning out of the dropout under high torque, which can cause serious damage to the bike's frame, motor, and wheel. Without a torque arm, an electric bike is more likely to experience catastrophic failures like the rear wheel falling off while riding, leading to serious accidents or injuries.

In addition to safety concerns, torque arms can also improve the overall performance of an electric bike. They help distribute the motor's power more evenly to the rear wheel, reducing wear and tear on the bike's components and improving its efficiency. With the use of a torque arm, you can also ride with confidence and peace of mind, knowing that your bike is protected from any potential damage caused by the high torque generated by the motor.

If you have an off-the-shelf e-bike, then you will not need a torque arm as the frame of the e-bike is designed to withstand the torque from the motor perfectly. Whereas if you are making your own modifications, then odds are you will probably need a torque arm. It depends on the type of bike as well as the type of motor.

Type of bike

The frame material of the bike is very important. Most bikes today are made of aluminium, which is not strong enough to withstand the torque of a powerful motor.

Type of motor

Firstly there is the difference between a front drive motor and a rear drive motor. The front fork of a bike is generally much weaker than the rear fork, meaning that a front drive hub motor conversion will require more support from a torque arm.

The second is the power of the motor. A low power motor such as a 250w motor has very little torque and a normal bike fork can usually handle it, whereas a 500w motor will generally reach the limit of an aluminium fork. 750w, 1000w or even 1500w motors will almost always require a torque arm, especially for a front fork, and that much torque will quickly destroy your bike.

Torque Arm Specifications

Firstly, you need to pay attention to the material of the torque arm, stainless steel will be stronger than aluminium, try to buy a stainless steel torque arm.

Secondly, A one inch long torque arm is good, two inches is better, and three inches is better yet. further from the axle that the torque arm mounts to the frame, the more force it can resist.

Finally, the price of a torque arm, torque arms are not expensive, a sturdy torque arm costs around $10-$30, which is a small investment that can prevent danger.


In conclusion, electric bikes are becoming increasingly popular, but it's important to remember that safety should always be a top priority. Installing a torque arm on your electric bike is a critical safety component that can prevent accidents and damage to your bike's components. With the additional support provided by torque arms, you can ride with confidence and peace of mind, knowing that your bike is protected from the high torque generated by the motor. While the installation process may be technical, it's worth seeking assistance from a professional to ensure your torque arm is installed correctly. Don't compromise your safety and the safety of others on the road - invest in a torque arm for your electric bike.

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