Just get the wheels if you like them so much. You now have Scott's and Glen's harder core experience and their specs. I think you will be fine if you stay within that offset range. Even if the already-bought-4-tires were not fitting idealy, there are others available, and it's easier than replacing the wheels. :-) After all, you only have 10mm to gain or to lose. So, I say Go Go Go, Antony!!!!!