Originally Posted by cementsurfer
The pitch of the tamiya mini gears is 48, but it's a metric type 48 pitch belive it or not, there is a difference, the best thing to do is to buy the tamiya gears, that way there's no hassle. Other companies have 48 pitch gears, but they don't seem to mesh just right,and consequently creates a lot of noise and friction in the end....
The Tamiya AV gears are 0.6 module, or 42 pitch. robinson racing makes some good pinions out of 42pitch however i dont use them cos they uses an imperial scale grub screw. would still go with Tamiya AV gears
48pitch and 42pitch will run but will cause a lot of friction until both are pretty worn or meshed in.