Yerf-Dog Model #1203A Go-kart Tire size

[SterbenYerf]

I have a Yerf-Dog Model #1203A Go-kart and I need new tires and wheels but i don't know what size to get help please?

 

[OzFab]

What are the numbers on your current tyres? Failing that, what size are the rims? Take & post pics with a tape measure or ruler showing the rim diameter & width...