What are the largest Technic-compatible tires on the market? I am looking for the largest LEGO wheels with tires available to build a nice-sized RC LEGO car.

Of course I will start with the simplest prototype, but I would like to achieve a design which will embed an automatic gear box and quite a large propulsion system. So the size of the wheels will be important.



Edit: The "Wheel 81.6x15" 2903 @Pubby8 found seem to be the biggest. But they are thin... Are there any other larger ones? Even 3rd party would be good.

Edit: @Joubarc &amp; @Pubby8 found the biggest wheels but without tires I am still looking for 3rd party solutions before accepting an answer.
The largest wheels I know are these (I measured 110x63 mm, including tyres), but they are quite rare (only available in one single set):

Weels: 22969 "Wheel Technic Racing"
Tyres: 32298 "Tyre Power Puller"

The wheels itself are not that big, but if you include the tyres, they are really huge:



They would probably work really well for an RC car.