I’ll take pictures tonight of the front axle with my caliper. I think they’re .66" in diameter which is a hair bigger than the standard 5/8. Someone will have to know something about the correct bearing size. FYI that first picture at the top of this thread is the yard kart in the state that I bought it in. They just drilled a 58mm bolt pattern on the rim of the back atv wheel that was 78mm rims. The front wheels were slapped on tractor/lawn mower/wagon tires and rims.