a bunch of us already know thiis, but incase someone is wondering this is how the sizing of a tire breaks down.
275/30R20
275: 275mm. its the width of the tire
30: the series of the tire. its in relation to the width of the tire. 30% OF 275.
R: This denotes radial. the tires rating can come before the R such as ZR
20: This is the size of wheel it goes on. 20 inch rim in this case.
so in the case of the 225/45 and the 245/45 the side walls are 101.25mm and 110.25 or 3.99inches and 4.34inches
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