Are we thinking about specifying a minimum/maximum rim diameter? I'm curious to see if I can use some 1/10 or 1/8 scale nitro wheels/tires, since they are very affordable (and I already have some!). The fronts are pretty easy to adapt; the rears might be a bit more of a challenge.
EDIT: for comparison, 1/8 scale rims are about 2.14" diameter, and 1/10 rims are about 2.00" diameter.