Even if we stick just to the US (as it has already been noted that 22.5 is the standard nearly everywhere else, including Europe and Central/South America), GM and MCI together account for the lion's share of the market, past and present, and 12R22.5 (and, more recently, 315/80R22.5) account for the majority of tires/wheels on those brands.And, of course, Eagle is no longer (not counting the new s