Originally Posted by tomdav
Looks like a 48p but check out the pic and you can see its mounted at the very end of the armature shaft. Looks like the setscrew is on the very edge.
You can see that the belt is between the can and the pinion.
The belt runs in a recessed part of the motor mount, just like the MX4 front belt did.
There is no problems with fitting pinions, though as you said they simply sit further out than normal.
As for wheels- mtr bkr is correct. AE/Losi rims plus adaptors for Yokomo rims.