So I'm brainstorming the idea of going belt driven.. Why not go all the way right haha.
Main advantages of going belt driven are:

1) No more spur, pinion meshing
2) No possibility of stripping diff gears

But there are a couple challenges I face, I cant, for the life of me, find the ring gear/ pinion gear teeth count on the differential to calculate the ratio. And I would really REALLY not like to open the diff just to count the teeth.

Secondly, never owned a belt drive system, so making one is going to be reliant on a lot of inspiration from google, and getting the right belt gear ratios is going to be tricky, I dont want to design an inefficient setup.

Besides bearings, I have spare belts from my 3D printer, bought like 10m of fibre reinforced belting as an upgrade and havent had to change it out yet, so snagging 30cm of it wouldnt be an issue.

Of course all the diffs would be designed by myself so no parts needed there.

I would go ball diff front and rear, and already have an idea of how that would work.

So if anyone has a belt drive rc, could you tell me:
1) how many belt gears it has
2) teeth count on each gear
3) motor and cell count
4) apprx. top speed