![Big pulley](https://skygear.cz/381-large_default/velka-remenice.jpg)
Big pulley for Simonini Mini2plus
Depending on your prefered reduction ratio you can choose the right size of the pulley.
The reduction ratio is important when you are choosing right propeller.
If you have small pulley diameter 53mm which is the standard, you will have the reduction ratio as follows:
With big pulley 129mm ... 1 : 2,4
With big pulley 138mm ... 1 : 2,6
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