The whels is check were the factory steel 5 spoke from a '92 4wd F-150 with the offroad package. The center bore is not much smaller, but it is smaller. I considered taking the plasma cutter to them , but decided that I'd wait for some other wheels. The tires i have now only have 6,000 miles, and the main reason I'd change wheels would be for larger tires. So if I still have my sporty at 150,000 miles, or come into some large amount of extra money they'll have to wait.