225 and 245 are the width of the tire. 40 and 45 are percentages of the width that calculates the size of the sidewall. therefor 225/40 and 245/40 would have a different height sidewall.
Here's a calculator:
http://www.miata.net/garage/tirecalc.html
The stock size is 225/50/16
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1987 Winnebago Elandan 35'
2001 Yamaha Roadstar 1600
2004 Ford Excursion Eddie Bauer, 6.0litre Power Stroke Diesel - Daily Driver.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well-preserved body, but rather to skid in sideways, scotch in one hand, body thoroughly used up, totally worn out and screaming HOOOOYA !!!!!
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