[bender]

Yep, with that DI running Losi rims, I also assumed they are running yokomo adaptors up front.

As for the rear, Losi rims will force-fit onto a 5mm axle (3/16" = 4.8mm approx) if you push hard enough, but I assume he just drilled them out.

The difference is the pin, which is a smaller diameter on the Losi cars. Again, maybe you can just force the rim on into the pin, or alternatively use the Losi pin and be careful that it doesn't fall out.