Hey screamin chicken..
These are the wheels and tires I think FgMan is talkin about
:
http://www.rc-car-online-shop.de/lsh...terreifen,.htm
They are stadium wheels with what I think are Hormann Jumbo tires. The Hormann Jumbo tires seem to look similar to the marder tires but are wider with an extra row of spikes.
You could always get marder tires mounted on leopard rims which are an offset wheel??? Not sure if thay would rub your stadium body??
I've got a Monster Beetle and the monster tires don't have very good grip on grass compared to my brothers marder tires.
Hope this helps.