My stock measurements were 26.5" front and 26.625" rear. But, that was on 225/40R18, so that should be 0.5" diameter smaller or 0.25" shorter overall. So, I'm guessing that with stock 215/45R18s I would have measured 26.75" front and 26.875" rear.
After, I'm measuring 25.75" front and 26.5"...