No problem here. Calimini claims their 30% stronger than stock.
Even though their a higher raito, which usally means more and smaller teeth. These have fewer teeth and the teeth are bigger in size if you compair the two.
Actual diameter of the pinion is smaller of course but like I said the teeth them selves are larger.
I also had someone tell in their opion they would break, but they never tried them and didn't know anyone who did. I say go for it.