HA. Me and the 3 year old are totally on the same wavelength! Well I'm not surprised, the wife tells me I act like a 3 year old when I'm around cars ("I'm not addicted, I can stop whenever I want"). that's cool that it rolls so easily that a 3 year old can push it with ease.
If MAX was a 5 lug car I'd suggest getting some old suburban rims for it, they look almost exactly like the Mach5's rims. Sorry I can't help it, I've been obsessed with Speed Racer since I was like 4 or 5.