Don't Risk Failure

Grin Torque Arms

Universal torque arms for all hub motors

What are torque arms?

Torque arms are used to prevent axle rotation in hub motors. When a hub motor is powered up running, for all the torque that the motor generates spinning a wheel forwards, there is an equal and opposite torque on the axle causing it to rotate backwards.

High power systems that generate a lot of torque, or in setups with weak dropouts, the forces present can exceed the material strength and pry the dropout open. When that happens, the axle will spin freely, wrapping and severing off the motor cables and potentially causing the wheel to fall right out of the bike.

A torque arm is a separate piece of metal attached to the axle which can take this axle torque and transfer it further up the frame, thus relieving the dropout itself from taking all of the stresses.

The Grin Difference

Grin was the original inventor of the ebike torque arm almost 20 years ago and continues to engineer the most reliable torque arms on the planet.

Don't Risk Failure

Knock-off torque arms use cheap materials and inadequte design. They fail unexpectedly, causing motor damage or detaching the front wheel from the bike while riding. Use a Grin tested and engineered Torque Arm.

Close-up of a mechanical component with copper windings and wiring.

Axle spin out

Spreads Steel

Breaks aluminum

Universal Torque Arms

V7 - Regen

Engineered for Regen Braking

Our V7 Torque Arm is designed for motors with regenerative braking, and has a unique and powerful clamping system that puts over 1500 pounds of compressive force on the axle flats to prevent any back and forth wiggle.

Shop V7

V6 - No Eyelets

Install front or rear

The V6 Torque Arm uses a separate hardened metal insert with a toothed interface allowing for flexible positioning in both front and rear motor installations.

Shop V6

V5 - For Eyelets

Install at any angle

The V5 Torque Arm has the same hardened metal insert feature as our V6 arm, but secures to the frame via existing fender eyelets rather than using external hose clamps.

Shop V5

Highlights

Built for e-bikes

Grin torque arms are engineered to withstand the power of modern ebike motors.

Compatible with regen-capable systems

Grin makes the only torque arm designed for regen-capable systems, engineered and tested to withstand repeated loading in opposite directions without failure.