By changing the length of the pulley boss located in the center of the pulley, the drive belt can be moved to the outside of the pulley and increases the maximum speed.
Furthermore, the two included shims allow you to set fine acceleration characteristics.
Kitaka Power Drive Kit High Speed Pulley Kit is designed based on normal pulley boss.
Therefore, the Kitaka Power Up Pulley Boss cannot be used with power drive kits, high speed pulley kits