8MM Mod 1 Pinions gears M4 set screws
these pinions will be changing once i run out of the older style. They will now have a rim on the back and the grub shoulder will be about 1mm wider.
8MM bore Mod 1 pinions M4 set screws. Hardened Steel. Gears have been tested to 200mph+.
mostly used for 8th scale rc's