Hi Ken,
Not sure if you can get 0.5 mod for RC cars, but 0.5 mod is very near to 48dp.
The older Tamiya's had 0.8 mod which is as near as damn it to 32d.p. . Also 64dp is aprox 0.4 mod.
The following site shows how to calculate the dp/mod size and gives a comparison table at the bottom.
http://www.astronomiainumbria.org/ad...h/geardata.htm
Cheers
Chris