M14 Torque Arm for Hub Motor – E-Bike & E-Scooter Axle Support (1 pc)

This M14 torque arm is a steel support lever with an M14 axle hole, built for hub motors on electric bikes, electric scooters and light electric platforms. It mounts to the rear or front axle and absorbs the twisting force the motor sends into your frame. Each unit covers one mounting side.

A hub motor delivers its torque straight into the axle. As a result, the axle tries to spin inside the frame dropouts. The arm slides onto the flat machined faces of the axle and braces against a solid point on the frame or fork. Torque then travels away from the axle slots and into that strong anchor point.

This product is intended for hub motors only. Mid-drive systems do not need it, because their torque passes through the chain instead of the axle. Conversion kit builders and riders upgrading controller power will get the most value from it.

Key Benefits

• Axle spin protection – stops the M14 axle from rotating inside the frame dropouts while riding.
• Dropout protection – shields the frame ears from widening and permanent deformation.
• Stability for stronger systems – recommended whenever torque output or controller power increases.
• M14 axle hole – sized for higher-power hub motors that use a thicker axle.
• Universal mounting – attaches to a frame or fork using a clamp, a bolt or a bracket.
• Freely oriented lever – you choose the direction based on your own anchor point.
• Front and rear compatible – works on either axle of the vehicle.
• Pairable design – two arms, left and right, spread the load symmetrically.

Who Is This For?

The arm suits e-bikes, electric scooters and light electric platforms fitted with a hub motor. It works equally well on the rear axle and the front axle. The essential requirement is an M14 axle with matching flat geometry on the shaft.

Riders who install conversion kits themselves are the main audience. It also helps when you raise system power. For example, fitting a stronger controller increases the load on the axle. The original frame axle slots may then no longer cope with that force.

The lever is not suitable for mid-drive systems. In those setups torque never acts on the axle, so no external support is required. Check your motor type before ordering.

What’s in the Package?

• 1× torque arm (one mounting side), exactly as shown in the product photo

Technical Specifications

Why Choose This Torque Arm?

This lever does not limit torque in any way. Instead, it captures that force and redirects it to a firm anchor point. Motor power therefore stays exactly the same, while the frame ears stop carrying the full load.

The design is not tied to one specific frame model. You select the mounting point according to your own frame or fork. However, the chosen anchor surface must be rigid. Thin or flexible panels are not acceptable contact points.

Pair the installation with washers of suitable hardness for a secure fit. In addition, use clamps where extra grip is needed to prevent slipping. Check bolt tightness after the first 20-50 km, then repeat that inspection periodically.

Frequently Asked Questions

Is one torque arm enough?

• For lighter, low-torque systems a single arm is often sufficient.
• Powerful systems call for two units, one on the left and one on the right.
• Each package holds one mounting side, so a pair requires ordering 2 pcs.

Will this arm fit my frame?

• Fitment depends on your individual frame construction.
• The critical condition is a solid anchor surface for the end of the lever.
• Attachment works on a frame or fork via a clamp, bolt or bracket.
• Thin or flexible frame areas are unsuitable as anchor points.

Is it compatible with an M12 axle?

• This model is made for an M14 axle.
• An M12 axle may require modification before it fits.
• Always verify your axle size prior to installation.

Do I need one for a mid-drive motor?

• No. Mid-drive systems transfer torque through the chain.
• Because the axle sees no motor torque, external support is unnecessary.
• The arm is designed exclusively for hub motor builds.

Can I use it on the front wheel?

• Yes. The arm serves both the front and the rear axle.
• Front installs brace against the fork instead of the rear dropout area.
• The lever direction is chosen freely to match your anchor point.

Does a torque arm reduce motor power?

• No. It never restricts the torque the motor produces.
• It simply transfers that torque into a stronger support location.
• Frame dropouts then avoid absorbing the entire load.

When should I add a second arm?

• Add one after fitting a stronger controller or a higher-torque motor.
• Two arms distribute the load symmetrically across both axle sides.
• This setup suits heavier and faster electric vehicles.

How do I maintain the installation?

• Inspect bolt torque after the first 20-50 km of riding.
• Repeat those checks periodically throughout the season.
• Use washers of appropriate hardness to keep the joint stable.

Fitted correctly onto the flat faces of an M14 axle, this steel lever keeps your hub motor build secure and your dropouts intact. Order two units if you plan to brace both sides of a high-torque system.