Hi,
I produce Cen Genesis pinions, they're ΓΈ12x0.5mm thread.
Mine are machined and heat treated pinions, will last much more than the original.
They come with 17T & 21T but for a batch of at least 5 pieces I cna do the number of teeth you want from 17 up.
If you need more info please contact me at
[email protected]
Ciao