pinion vs spur teeth

Originally Posted by azjc

I have heard a ballpark figure is 3 spur teeth is equal to 1 pinion tooth, so if you have data/proof I am wrong please don't slam it in my face.....LOL..I am only being the messenger and dont know for sure

Well it has to do with the relation of the spur's size to the pinions size... I think.
It's late and now I just confused myself.