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In Reply to: tire sizes for 540IA posted by Jim Vomvas on May 07, 2000 at 19:04:12:
The tire is approximately 235mm from sidewall to sidewall.
The distance from the tread surface to the rim is 45% of that dimension.
It's a radial.
It mounts on a 17-inch rim.
The tire's rated for a 1477-lb load.
It's rated for continuous use at 168mph at some percentage (can't remember what it is right now - 85%?) of its maximum load.
See http://www.tirerack.com/tires/tiretech/speed.htm
for more information.
But there's one important consideration they don't mention: Calculated tire dimensions are not always accurate - 235/45-17 tires from two different manufacturers (and even from two tire lines by the same manufacturer) can and do vary in size - a Bridgestone RE71 or S-02 is slightly wider than a Dunlop SP8000.
The only way to find out exactly is to check the spec sheets. Fortunately, many are on the manufacturer's websites these days.