Torque arm for rear hub

[DtiK]

Hello.

How do you put torque arm in rear hubs like this for example:
https://en.wikipedia.org/wiki/Flip-flop_hub

I am looking for good new rear hub to replace my coaster brake single speed hub. That had already "arm" because of coaster brake... (https://si.shimano.com/pdfs/si/SI-2860B-000-ENG.pdf)

I dont see any place in fixie hub for torque arm ?!

 

[E-HP]

If you don’t have brakes, you don’t need a torque arm.


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[DtiK]

i'm planning to have braking with motor.

 

[Balmorhea]

A hub motor needs a torque arm. A coaster brake or drum brake hub needs a torque arm. An internally geared hub needs a torque arm, or torque washers.

But a plain hub without any of these things doesn't have any torque to transfer to the frame. That's why it doesn't have a torque arm.

If you're suggesting that the only brake you'll use is regenerative braking from the hub motor, well that's a bad idea.

 

[DtiK]

no, i have disc brakes at front. but im using mid motor to brake rear wheel.

 

[NCC1941]

If you're using the mid-drive for braking, than that's what needs the torque arm (or rather, it just needs to be very securely installed in general).

The hub doesn't need a torque arm for the same reason that you pedaling your single-speed or derailleur bicycle doesn't necessitate a rear hub torque arm - no torque is being transferred via the axle, so there's no need to brace the axle against that nonexistent torque.

 

[E-HP]

no, i have disc brakes at front. but im using mid motor to brake rear wheel.

Maybe if you provide your reasoning for why you think you need a torque arm, that would help others know what you are talking about.