I was at the junkyard today and they had pulled in a 91 Ford Escort GT. I took the rims from it, since they were 15" and had a 4x100 bolt pattern even though I knew the center bore was a bit too small to fit on my Golf.
From what I have found, the center bore on the Escort was 54.1 and the bore on the VW is 57.1 Is that too much for a machine shop to remove from the rim?

