I need to replace my spur gear with a smaller one. Problem is I am having trouble finding one that works.

The one I am replacing is the stock Tsunami EPX spur gear. (installed it on my brushless motor) It is gold in color and is 18Tooth.

The catch is I don't want the same gear... I want one with LESS teeth... I would like a 15Tooth or 16Tooth.

Is this a Tamyia gear? Anyone know what I need to look for? pitch? etc...

Any help would be appreciated.

Thanks