What is the actual size of the 12" wheels?

[Adam Y.]

First lists them as being 12" but the wheel says they are 12.5". What is the right dimension.

[Kevin Sevcik]

Luckily I have a pair in front of me. My calculations say the wheels are neither. they're 12.2" in diameter with tires and all.

[Cory]

It's really dependant on how much you inflate the tires. If you inflate them more, they get larger. If you inflate them less, they arent as big.