500W 8FUN Mid-drive conversion kits is a geared motor and a chain wheel that is installed  on the bicycle bottom bracket, substituting crank shaft, chain wheel and cranks.

  • Crank operating motor kit

  • Suitable for down-hill and up-hill sport suspension mountain bikes

  • Using bicycle transmission

  • Super high torque taking mechanical advantage of the gear shift

  • Special frame consideration for installation

  • Heavier than hub motor kits

  • Some geometrical limitations for down tube battery cases

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