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Torque Arm etc

Torque_Diag (11K)

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.

In most electric bicycle hub motors, the axle is machined with flats on either side which key into the dropout slot and provide some measure of support against rotation. In many cases this is sufficient. However, in 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.

To give a sense of the magnitude of these forces, a hub motor with a 12mm axle generating 40 N-m of torque will exert a spreading force of just under 1000lb on each dropout. 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.

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Remplaat voor V-Brakes/Hydraulisch
Remplaat voor V-Brakes/Hydraulisch

Onze prijs: €58.00
inclusief BTW 21% ( €10.07 )
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STAINLESS SPACER SW1 8mm

STAINLESS SPACER SW1  8mm


Onze prijs: €3.00
inclusief BTW 21% ( €0.52 )
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Torque arm universel REV2 short

Torque arm universel REV2 short

De Torque arm zorgt ervoor om het draai moment van de motor (koppel) op te vangen, waardoor de as niet kan doordraaien. Dit voorkomt schade aan de motorkabel en voor/achter vork.


Onze prijs: €18.00
inclusief BTW 21% ( €3.12 )
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Torque arm universel REV3 long

Torque arm universel REV3 long

De Torque arm zorgt ervoor om het draai moment van de motor (koppel) op te vangen, waardoor de as niet kan doordraaien. Dit voorkomt schade aan de motorkabel en voor/achter vork.


Onze prijs: €30.00
inclusief BTW 21% ( €5.21 )
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Torque arm universel REV4 Achterwiel

Torque arm universel REV4 voor achterwiel motoren

De Torque arm zorgt ervoor om het draai moment van de motor (koppel) op te vangen, waardoor de as niet kan doordraaien. Dit voorkomt schade aan de motorkabel en voor/achter vork.


Onze prijs: €37.99
inclusief BTW 21% ( €6.59 )
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Torque arm 8mm
Pair of Torque arm plate for hub motors with small 10mm axles with 8mm axle flats, with bent tab specifically to fit forks of Brompton folding bicycles

Onze prijs: €15.00
inclusief BTW 21% ( €2.60 )
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DISC SPACER 2.5MM

2.5mm spacer to increase disk caliper clearance on hub motors


Onze prijs: €7.01
inclusief BTW 21% ( €1.22 )
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Stainless Spacer "C" Washer

Stainless Spacer C Washer to clear quick release lawyer lips on 12 and 14mm front axles


Onze prijs: €3.00
inclusief BTW 21% ( €0.52 )
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Stainless steel spacer washer 12-14mm

Stainless Steel spacer washer for building up 14mm rear axles


Onze prijs: €3.00
inclusief BTW 21% ( €0.52 )
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