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V-Brake Development

On my commuter bike I am currently running a 700c wheel on a 26″ fork, since the wheel is bigger than the fork is designed for, I cannot use a standard v-brake. I have designed a v-brake with a slot so the brake will fit almost any wheel and fork combination.

V-Brake

 

I designed the brake using SolidWorks, which let me do stress analysis to ensure it is strong enough. I have accounted for a max force from the cable (average grip strength of a male) to be 450 N. I calculated the force necessary to stop a 200 lbs rider from 50kph to a complete stop in 10 seconds to be 260 N. Given those forces I have calculated a minimum factor of safety of 2.0 using 7075 aluminum.

 

FEA V-Brake

 

After FEA was done, I 3D printed the brake arms to test fit everything. I wound my own springs using music wire and installed all the hardware. The brake works as expected for plastic, the next step is to machine it out of 7075 aluminum.

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2 thoughts on “V-Brake Development

  1. These are an awesome, simple design. Did you end up making a functional aluminum version? I have the same issue right now with a 27 1/4 fork and running a 700 c wheel on my fixie

    1. Thanks, so far I have made one side of an aluminum version and I am part way through the other side

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