You can also use regular 1/12th scale tires/wheels, i'm using Jaco 1/12th wheels but there are others that can be used on this chassis.
It's as simple as you don't mount the wheel hubs, the 3 screws that you need for the wheel hubs you will be needing them for mounting the 1/12th wheels.
They are also available in more compounds for a better tire tuning compared to the griplevels of the track.