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  • gear torque input

    Discussion in 'Calculations' started by jawnn, Feb 21, 2015.

    1. jawnn

      jawnn Well-Known Member

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      I want to use an strurmy-archer hub gear as a mid drive fro a heavy cargo bike. so that I can have extra low gear for hill climbing.
      I don't know if it can take the torque of an electric motor. and maybe ai could use cassett sprockets, but hopefully i will find a stronger chain.

      wheel speed should be no more than 20mph in the middle gear maybe less. i know that the low gear needs to be about 10mph or less.

      one HP motor and at least 450lbs to 500lbs on 9% grades.

      torque has to be within spec, this is it. Such a 3-speed hub can take 50 Nm max. You just have to find out which reduction you need. So you need to calc target input rpm of the 3-speed hub input
       
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    3. jawnn

      jawnn Well-Known Member

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      OK forget it, I thought about it and decided that the hub gear just can't be strong enough.
       

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