Ok I know that longboard wheels go up to about 76mm the smallest are somewhere around 60mm. But does it really matter what size you get for your board???
Larger wheels are more mass, thus will roll over objects easier. Larger wheels also have more mass, thus will hold speed longer and will have a higher max speed. Larger wheels can also cause wheelbite (the wheel hits the board and stops), which maybe cause you to fly off the board if your board was not designed to fit large wheels. Smaller wheels will accelerate faster, but may not be able to roll over as many objects. Smaller wheels have less mass so they will not hold our their speed as long. Smaller wheels will be able to fit on more boards without getting wheelbite though.
