First off, kudos to the guys putting together the packages for Xfire owners. Second, I run 19s and 20s. 20s and 20s is no big deal. There have been several with 20s and larger all around. Plus, it sounds like these guys are test fitting for accuracy. They even know about the common lug problem. Those wheels look sweet! I say go for it and don't ber afraid to plus size your wheels. Mine are one inch larger, but the overall diameter changed little.